Adding your branch to your store is very straight forward 👍
To add Branch:
Store Settings > General > Branches > + New Branch > Enter Details > Save.
Setting default branch:
If you have more than one branch, the default branch can be chosen by going to Store Settings > General > Site Profile > Store Detail > Change Default Branch > Search Created Branch > Save.
See our other article for Setup Checklist for a New Branch with ERP Integrations.