Orda syncs your locations and inventory from Square Dashboard automatically. Note that the items are taken from Square Dashboard, not Square Online. Here is the guide on creating items and categories in Square Dashboard: https://squareup.com/help/us/en/article/5115-create-and-manage-items-online
When you enable a category in Orda, it will show in the locations the category is enabled for in Square Dashboard.
Orda will show items in the right location based on your Square item configuration.
See "Multi-Location Item Management" in the Square Support.
Head over to item library, clcik on an item to edit
On the item select the location section, usualy marked with all locations as default
Select the locations you want this item to appear for and click on save