1 - Create XML Feed for catalog here
2 - Insert Facebook Business Manager

3 - Go to Assetes / Catalogue Manager under the main menu and click Create Catalogue


4 - Create emty Catalog for e-commerce
5 - Select Upload Product Info under the Configure your catalogue settings


6 - After than create catalog go to Product data sources


7 - Click Add Products


8 - Select Use Data Feed and Click Next


9 - Select Set automatic file upload schedule


10 - Insert Data Feed URL (Copy to clipboard Data Feed URL(s) and insert)


11 - Set Schedule and click Start Upload