Newbie Question - How do I get a contract to populate so I can apply an invoice?

We just had our information migrated over from QuickBooks. I am having a lot of trouble with invoice entry. I was able to edit the change orders migrated so that when I enter in subcontractor information, the change orders pop up. However, I cannot figure out how to do the same for the original contract amount. Any suggestions appreciated.

Thanks,

Liz