Can an item field be added to the planning worksheet?

We would like to add the Inventory Posting Group field (11) from the item table (27) to the Planning Worksheet (99000852)  so that we can filter on various posting groups to review them before carrying out action messages.

I have been able to add a new flow field to the Requisition Line table (246) and it appears in the table fields when viewing the table.

I have that field placed on the Planning Worksheet Line List (99000860) AddAfter Descripiton but it does not appear there.

To test this I did place it on the Planning Worksheet (99000852) but that puts it at the bottom of the page instad of in the list of action items to carry out.

Is this possible and if so am I going about this the wrong way?

Thank you