This can't be done in a table, it would need to be on a form. In the
AfterUpdate event of the combo box, you would assign the value to the
textbox. The Value of the combo box comes from the Bound Column, but you can
specify which column you want to get information from.
Example:
If Me.cboMyCombo.Column(1) <> "Other" Then
Me.txtMyTextbox = Me.cboMyCombo
End If
This assumes that the GL value is in the Bound Column. If not, you'll need
to specify the column desired in the second line also. The index number of
the Column property is zero based, so 0 is the first column, 1 is the
second, etc.

Signature
Wayne Morgan
MS Access MVP
>I have a table with two fields [Type of Trade] and the other field [GL]
>which
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>
> How would I code this?