Populate A Bound TxtBox And Not Have It Update Table?

It's an unusual request, I know, but it's necessary for my purpose.

I have a form, frmMain that I use to update a number of tables. On it is a number of combo boxs, comProduct, comBrand, comSize, comPrice and comQuantity. comProduct opens a new form, frmNew if the users input is not already in the table. On frmNew there are again combo boxes comProduct, comBrand and comSize. This form adds the record to the table.

So, if I input a new value - not already in the database - for product in the comProduct combo box, the form frmNew appears and I can proceed to define the product, brand and size of the new record. The form then closes and reopens frmMain and tabs across to comQuantity (skipping the fields I've already defined in frmNew).

Now if you can wrap your head around that, here is the problem: Because I've already entered the values for product, brand and size in frmNew, I want them to automatically appear in the appropriate combo boxs on the frmMain form. I've been using the following code (executed from frmNew, so Me = frmNew):

Code:[Forms]![frmMain].[comProduct] = Me.comProduct[Forms]![frmMain].[comSize] = Me.comSize[Forms]![frmMain].[comBrand] = Me.comBrand

It works, but I've since discovered it creates a new record in the table so I end up with two duplicate records (one when I submit frmNew and another when the values are automatically input into frmMain.)

Now, my question: How can I display these values in frmMain without having them create the second record? I was thinking of using a SELECT query somehow, but I don't know where to begin. I also considered using labels instead of comb boxes, but I'll need to be able to edit them if the record already exists.