You must have Vendors set up with an A/R account for the warranty company to show when creating creating a Service Request. The first step is to set the Vendor as an A/R Customer:
Click the Menu icon
Expand the Vendor menu
Search for the vendor
Select the +A/R Customer button - Note: if they are already set up as an A/R Customer, that option will now show
5. Expand the Accounts Receivable menu
6. Click on the AR Aging list menu option
7. Search for the vendor
Note: You will need to uncheck the Balance Due filter to view all accounts including ones that have no money owed.
Click the pencil icon to edit
8. Check the Warranty Company option
9. Click the Save Changes button - This vendor will now show in the Warranty Company dropdown on the Service Request
10. Expand the Point of Sale menu
11. Click on the Service Request tab
12. Click the Edit icon
13. Click the Warranty Company dropdown and verify you are seeing the Vendor.