how can i set query criteria to:
If the number is in the list, filter only for the number, if not, show the list.

number being from a form
list is a field in the query

i have so far
iif([Forms]![frmtrinput]![Text103]=[priority],[Forms]![frmtrinput]![Text103])

have tried
like iif([Forms]![frmtrinput]![Text103]=[priority],[Forms]![frmtrinput]![Text103],"*")