In some cases developers want to remove the selected record in a Single Selection subform. The way to deselect the highlighted record in the subform is change the current record pointer for the subform table before or while the detail form is open.

For example, if you want the selected record in the subform to be removed when the form is opened, put this code in your detail form's Form Method:

Case of
: (Form Event = On Load)
LAST RECORD([subformtable])
NEXT RECORD([subformtable])
End case