Easy, no.  You will have to export from the backup company and import into the Live Company.

Not much experience in this, I exported the SO_Header and Details.  Which order do I need to import or do I need to create one file for the import?  I tried just importing the header and of course received errors saying no lines and totals were zero.

If you don't mind going one by one, you might take a look at the "Copy From" feature in SO Entry.  You'd just need to find a copy of each one you want to re-create.

It won't allow you to copy from another company code, but you can copy from open SO, SO history, and invoice history.

Since there are 2 tables involved you have to make sure you get data from both. You want to Export from SO_Detail and include SO_Header fields - then you import into SO_Header and include SO_Detail fields. Your Sage Business Partner will know how to do this.