How to remove unused visual columns from model data.

Step 1: Have one list containing columns added to all visuals tracked.

Step 2: Have another list containing all of the columns of the model data tracked (separately to the first list).

Step 3: Go to Home tab, then in the Queries section, click on Transform Data.

Step 4: Go to Home tab, then in Manage Columns section, click on Remove columns not used in visuals (name pending)

(Behind the scenes)

Columns to keep: (thanks to Step 2)	Columns to remove:
Date Document No. Product Code Qty Customer No. Customer Customer Email Phone External Document No.	(Everything else) May refer to the existing remove other columns feature. However, the chosen selected columns to keep are found on here / Step 2.

Hope this helps.