Inventory Ageing help FIFO

Hi all, i am trying to get the age of inventory items that I have in stock

The attached example show Row 1 actual inventory item (8 pcs)

From Row 2 onwards are the receipt qty (71 pcs) and dates of that inventory item

I am looking for code that will delete all the oldest dates down until it matched the same quatity i have in stock??


any help much apprecaited