I'm not sure what you are trying to do. In noraml situation, this is how you would append, delete etc.

set exclusive off
clos data
sele 0
use master
sele 0
use temp
** in the form field text1 for example is billno, and text2 is date in
** give them variable names in "control source" eg. nBillno, dDatein etc.
sele temp
delete all
append from master for billno=nBillno and datein=dDatein
*** then refresh grid or form etc.
*** replace fields etc as required

clos database
** once the job is done, pack the files
use temp excl
pack
clos data

Now if I have some more information what you are acutally trying to do, I may be help you more. Shafid