When the project has an approval number:

Use the menu under tools to select Regional Mod or Type Certificate Transfer

But make sure you are logged into the region where the approval is currently located, not the region you want to transfer to (Or any other region)

...

If the Project doesn’t have an approval number:

If the project is a standalone TC (Type Certificate/CAN-TSO) project with out an approval number.

An admin can change the OPI Region in System tables Napa TC Projects (TA_PROJ) table.

...