You are not really supposed to put any data entry field on the form twice. Ideally, you would have the common data entry fields on the form at the top of the form, and then have tables below for the non common fields. If you need to display a field on a form twice, you can make a formula field just equal to the field and use the formula field once or more times on the form.
You maybe be able to trick the form into allowing a duplicate data entry field on the form by putting the [Related Parent] field on the from as well as the Proxy field - [Parent Name]. its not really recommended but the system will try to keep the two duplicate fields have the same value.
But the best way is to have common data entry fields in a common section at the top.
------------------------------
Mark Shnier (YQC)
Quick Base Solution Provider
Your Quick Base Coach
http://QuickBaseCoach.commark.shnier@gmail.com
------------------------------