To migrate data from other systems to Bitrix24, you need to install the appropriate application in the marketplace and import the data into your acoount.
How to import data
First, enable Inventory management option in your Bitrix24.
Click on the Migrate data from other systems button to install the app from the marketplace.
Open the app. First, enter your account username and password. Then start the migration.
Data migration may take some time. The duration depends on the amount of data.
When the import is complete, you will have documents in your Inventory management section. The products will be added to the catalog.