Selling items back to the store by parts

We all know how we can buy the wrong item and then return it using the undo button. But, what if 3 mins later we realize it's not what we needed? What if instead of I need and I just need to sell and to get back to where I need to be instead of selling the whole item? What I am trying to say is, that just how we are able to buy items by parts we should be able to sell them by parts too. I know it would have to include a bit more of code calculating the amount of slots that you would need to have free before getting the individual parts back, but that is no small feat for you guys.

This would allow more build flexibility and fast adaption to the opponent team during the early game. since it's when players usually have a decent amount of slots free. I guess, like everything else it could be put in the PBE and see what happens, even though I have never used PBE myself.