Apportion a Schedule C business across multiple states. All states have gross receipts and wages, but all assets and rents are in only one state.

All details in apportionment section of Schedule C have been entered. But it does not seem to be working.

• What specific steps are necessary to prepare?
• Or, can this even be done in this way?

Yes this is a first attempt at taming such a return. Any and all assistance is greatly appreciated! 

(Related? Have found Help reference to "Set Apportionment Options" in Settings > Options > Tax Return but I'm not finding Section "Multi-State Options" where Apportionment settings are to exist)