How to have one portal update another?

[deego55]

I hope i can explain this clearly.

I have a parent TASK table. Two children tables, BUDGET and FUNDING, tied to TASK

On the main layout I have portals for both children tables. A button script adds a new portal row in BUDGET. When i add a new portal record, I would also like to add a new FUNDING portal record and any data that is typed into BUDGET will get copied into FUNDING.

I hope to allow the user to manipulate the data in FUNDING, without touching the fields in BUDGET.

How would i accomplish this? Thank you!