Maybelle,

If a have a parent file with 2 fields as key (example: Customer Code and Invoice No.), how do I link them to my child file containing the same 2 fields among other fields? Also, how can I use a grid in a form for the child file with this?

Your child table must be indexed on those two fields and SET a RELATION to it from the parent, like so:

USE tblParent IN 0
USE tblChild IN 0

SELECT tblChild
INDEX ON custcode+invno TAG mytag

SELECT tblParent
SET RELATION TO custcode+invno INTO tblChild

As you move along the Parent records, it will automatically point you to the related records in your child.

Use this same setup in your form to achieve what you want for the grid containing child data.

Hope to help.

Dennis