Locate your Settings icon in the top right corner of QuickBooks:

Choose Account and Settings from the menu: 

Then Advanced Settings where you can add classes:

Click the Edit icon to the right of the Categories section to turn on Classes:

Go back to the Settings Icon and choose 'All lists' in the menu:

Then, click on Classes:

Add your marketplaces one at a time by clicking on the green New button in the top right corner:

When you are done creating classes for your marketplaces, refresh your QuickBooks cache in A2X, as shown below:

After you've refreshed your cache, your classes will be available to map to in Invoice Settings:

You will see them in the dropdown list:

Click on 'Update Invoice Settings', so that when you send the settlements over to QuickBooks Online, transactions will be classed by the marketplace they are from.

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