Problem , auto filling value based on dropdown list
i am creating filemaker solution , this has 2 tables, 01. Contacts and other one is Diary, . i want to do some implimentation from my contacts.
* when i am opening the contact called Mr XXXX, he has Unique id called 1.
* i want to pick another user from same layout, for this i created another field called last_nameX (contact table)
* And i pointed this as a drop downlist from my all contact's last name field.
* so now i can pick Mr BBBB when i look at the Mr XXXX's record ,
* my problem here is picking the contact of Mr BBBB, i want to get Mr BBB's Uniquie id in to new field called "Last nameXID"
* all thease fields are in Contact table,
I have attached the screen shot here
Thanks in Advance