Opening a linked subform

Here is my (simplified) situation:

I have a form with a subform.  The subform contains many fields.  Depending on the value in the subform's combo box, a specific form opens.  This form that opens contains text boxes which are fields that are in the same table as the original subform. I use the following code to open a specific form from a combo box and command button:

Private Sub Command82_Click()
If Me.Combo73 = "2" Then
 DoCmd.OpenForm "Macroform"
 Else: DoCmd.OpenForm "Switchboard"
End If
End Sub

Obviously this only opens two forms, based on one value.  My problem is that I cannot get the form that pops up to "remember" which "ID" it belongs to.  Let me give you an example:

This database is to monitor investment funds.  Different funds have different strategies.  Some invest in stocks, some in bonds, etc.  Therefore, a user will want fields relating to stocks (small, mid, large cap) to open up on one form, and fields relating to bonds (US Government, Investment Grade, Junk Bonds) to open up in another.  Naturally, the form that opens up depends on the strategy of the fund.  All the fields (from small cap stocks to Junk Bonds) are in the table that contains the funds' details. Only when someone chooses a strategy from the combo box and clicks on the command button, do I want a form to open up that has the relevant fields.

How can I get the form that "pops up" open to the respective fund's information?

I know very little VBA code, so if possible, please be explicit.  Thanks.