Hi,
You can incorporate sales from other platforms into MyCostPro, you just need to make sure all of the required information is present for the reporting calculations(see below):
(note the columns indicated with * may be hidden by default)
* "Item/Transaction ID (Unique)" - this can be filled in with any unique value
"Quantity" - how many sold in this transaction
"Sale Date" - self explanatory
* "Month Sold" - First day of the month of Sale date, can be populated by formula if you choose. Example: 3/1/2022 if the item sold on 3/20/2022
"Sale Price" - self explanatory
Let me know if you have any trouble