How can we copy value of territory field from entry or summary screen to other tab in Company Screen?

Dear members,

I am writing this post to ask you about how we can copy value of territory field in one tab to another tab in company screen(i.e: company summary scree). I use sage crm version 7.2.

In image below describe what I mean:

On Company Summary Screen i have Territory Value: Worldwide(or other)

and then click on opportunity tab and click on new opportunity

on the new opportunity entry screen, i want that territory field shows the same value to the territory field in company summary screen.

not only for worldwide but also the other value that base on value selected in company summary screen.

your response is to be appreciated,

best regard,