Work book and vba

This is a timesheet entry and employee update doc to track productivity.

1.      I would like the cursor to start in the INITIALS box.  Currently, when the initials are entered it auto pops the FNAME, LNAME, STATUS and HDEPT.
a.      I would like the cursor to jump to the FUNCTION CODE box and using the tab to the A#, TIME, UNITS, ADD button.
b.      After pressing enter when the ADD button is active, can the A# box be cleared?
2.      All this data updates the Timesheet Tab
a.      When I ADD, I get an error
 Runtime error 424
the debugger highlights     .Cells(lastrow + 1, "G").Value = TxtUPH.Text


Private Sub ccmdAdd_Click()
   Dim lastrow As Long
   
   With Sheets("Timesheet")
     lastrow = .Range("A1048576").End(xlUp).Row
    'lastrow = Sheets("Timesheet").Range("A2").End(xlDown).Row
    .Cells(lastrow + 1, "A").Value = ComboBox1.Text
    .Cells(lastrow + 1, "B").Value = TxtDate.Text
    .Cells(lastrow + 1, "C").Value = CB2FunctionCode.Text
    .Cells(lastrow + 1, "D").Value = TxtA.Text
    .Cells(lastrow + 1, "E").Value = TxtTime.Text
    .Cells(lastrow + 1, "F").Value = TxtUnits.Text
    .Cells(lastrow + 1, "G").Value = TxtUPH.Text
    .Cells(lastrow + 1, "H").Value = TxtFname.Text
    .Cells(lastrow + 1, "I").Value = TxtLName.Text
    .Cells(lastrow + 1, "J").Value = TxtHDept.Text
   
   End With
 
 End Sub
 
b.      When I enter a new line item through the TIME SHEET ENRTY it removes the functions that are in place.  I have a VLOOKUP function in the DESCRIPTION column to add the description by the code entered and in UNITSperHR.  It doesn’t update the rest of the information LNAME, FNAME and HDEPT.  See row 35 and 36 for example.
Thanks for your time

Jody