In my example I have used a google document to arrange multiple categories mapped under the element <categories> within Channable, however any type of document with product data that is accepted by Channable should work the same way.
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In your document you should create three rows (e.g: categoryid, categoryurl and categoryname).
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Where applicable you then list the different categories within these fields under each item. You can split multiple categories with " | " in a single field. See the below example:
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After this is done, you can upload the desired document in Channable.
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When the item upload has been completed successfully, create a new Datatrics feed in Channable under the tab "Feeds".

In your newly created feed, go to the "Rules" section.
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Here it is important to split the three category fields you have created in the document (categoryid, categoryurl, categoryname), so all the categories can be mapped under the element <categories>.
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You can do this with the "split text to list" option.
If "all" then take "categoryid" and "split text to list" split on " | "
when you have done this for all three fields, press save to save these rules.
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See below screenshot:
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Now you have to map the different fields. Go to the tab "Finalize" in your feed.
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Map the fields the same way as shown in the screenshot below:
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When the mapping of all the fields are finished, press the button "save & run".
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Now check to see the results in the "Preview" tab, you will effectively see different categories mapped under the element <categories>.
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See the below screenshot:
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You have now successfully added multiple categories to a single item in Channable that can be used in Datatrics.
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