Adding a row to my worksheet.

Here's a macro you can use. By 'previous row' I assume you mean the row that was the last row before the new one was added.

Sub AddRow()
    Dim LastRow As Long
    
    LastRow = ActiveSheet.UsedRange.Rows.Count
    Rows(LastRow & ":" & LastRow).Select
    Selection.Copy
    Rows(LastRow + 1 & ":" & LastRow + 1).Select
    Application.CutCopyMode = False
    Selection.Copy
    Selection.PasteSpecial Paste:=xlPasteFormats, Operation:=xlNone, _
        SkipBlanks:=False, Transpose:=False
End Sub

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If you want a more demanding / versatile solution try the one demonstrated in the attached workbook. I developed this for posting on another site (they won't let me link you to that site here) and copy from what I wrote there, more or less:-
At the heart of the action is the Sub AddRow which will copy not only formats but also formulas, but not constant values, from a source row. It allows you to specify the row you wish to insert, the row from which to copy and the sheet on which the action is to take place. All these arguments are optional. If you don't supply them defaults will be used as explained in the following.

1. Ws = Worksheet
If you don't furnish this argument the procedure will work on the active worksheet. Unless you are running a complicated project where you add rows on a worksheet that you don't want to activate just yet the currently active worksheet will suit your requirements just fine and you don't need to specify anything.
2. Rs = Source Row
I often want formats and formulas copied from the first row. The argument is that, if I ever want to introduce changes I just have to introduce them in the first row and all new rows will take them from there. If this is what you want, just supply the number of your first row to the procedure. Remember that arguments must be supplied in the sequence of the parameters. If you want to supply Rs but don't supply Rt you must pass the argument as a named argument, like this AddRow Rs:=3. If you don't want to supply Rs or supply Rs<1 the procedure will copy from the last previous row in the worksheet. I have found that the logic of why to copy from the first row applies to the last row equally well.
3. Rt = Target Row
You may not wish to add the new row at the bottom of your worksheet which is the default. In some projects you prefer to add new rows at the top of the list or at some calculated location in your worksheet. By specifying Rt you can add your new row anywhere you want. If you specify, say, 12 a new row No. 12 will be inserted. The row that used to be No. 12 will become row 13. Unless you specified another source, formats and formulas will be copied from row 11 which will continue to be row 11.
4. On Error Resume Next
The source row is copied with all its contents. Then, in the copy, all contents except formulas is deleted. If there was nothing to delete because all cells were already blank an error occurs. The On Error Resume Next statement ensures that you never notice.
5. .Cells(1).Select
This line selects the first cell in the new row. If you don't want that cell selected, delete the line or change the cell. Cells(1) is in column A, Cells(2) in column B etc. If you have inserted the row in a worksheet other than the active one the cell will not be selected and an error occurs. However, due to the preceding Resume Next statement your program will continue running. If you wish to select a cell on a worksheet which isn't active you should activate the worksheet first. Insert .Activate immediately after the line With Ws.

There are many meaningful ways to call the above procedure. You may like the simplest one of all. The attached workbook has a small even procedure in the code sheet of the worksheet where you want the blank rows inserted (Sheet1). The effect of this procedure is that a new line will be added to your worksheet whenever you click on the first cell in the first blank row at its end. This would be easy to change to act on double-click (BeforeDoubleclick even instead of Selection_Change event).

I have added another method of calling the procedure in the attached workbook. A line will be added if you run the macro AppendRow manually. You can specify the arguments there, if you wish. In fact, you can have both methods of calling the procedure and use different arguments with each method.
130101-AppendRow.xlsm

I'm sure it works well, but it seems like overkill for such a simple requirement.

Hi Linda,
I'll do this for you, but I can't do it now because I'm practically on my way to the airport with a 12-hour flight before me. If you have the time to wait I can get this done within 72 hours. You will definitely need a program like the one I offered because you need the capability to insert at the end of a section, not necessarily the end of the sheet, as you know, of course. However, to find the exact row will definitely need some additional programming.
BTW, do you also want the current date inserted in the new row?

Can you post the workbook?

Hi Linda have a look at this update to your spreadsheet, inspired by MartinLiss & Faustulus. The code is added directly to your worksheet rather than a separate module, and triggered by the Worksheet_Change event. So when you add anything into column G, it checks if the format of the row below is the same as the current row format, and if not, it adds another row of the same format. Note it is an XLSM file now.

Private Sub Worksheet_Change(ByVal Target As Range)
On Error GoTo do_nothing
If Not Intersect(Range("G:G"), Target) Is Nothing Then
Application.EnableEvents = False
Application.ScreenUpdating = False
    If Target.Interior.Color <> Target.Offset(1, 0).Interior.Color Or _
       Target.Borders(xlEdgeRight).LineStyle <> Target.Offset(1, 0).Borders(xlEdgeRight).LineStyle Then
        Rows(Target.Row + 1).Insert Shift:=xlDown
        Rows(Target.Row).Copy Rows(Target.Row).Offset(1, 0)
        Rows(Target.Row + 1).ClearContents
        Rows(Target.Row + 1).Cells(1, 1).Value = Date
    End If
Else
End If
Application.ScreenUpdating = True
Application.EnableEvents = True
do_nothing:
End Sub

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Let us know if it works for you
...Terry
WS-AppProduction.xlsm

There is an option for Formats & Formulas to be extended automatically when data is added to a row immediately below existing data.

Currently working with xl03 where it is in Tools > Options > Edit > Top right option.

For xl07 and later I think it is under Excel Options with the Big Button.

Other option would be to convert the data to a table which will have similar affect.

Thanks
Rob H