As part of initial Sage integration configuration, it is possible to map Layer sub companies to different Sage Companies within the same Sage account.
Settings - Sage / Intacct - Map Sub Companies
If your instance of The Layer does not use sub companies, you will only see the Default Company entry. If there are multiple Sage companies in your Sage account, you can choose which one to map to.
View when multiple sub companies are present in The Layer: