Sure its hard to explain:
-Lets say you are making a Advanced Cooling Theta Photon cannon for your ship. it takes Thamium9 QTY 200, Chrysonite QTY:250 & gravitino balls Qty 10.
-Ok you have that installing in your ship and ready to go.
-Now make sure you ship has 3 available inventory slots and DISMANTLE the Advanced Cooling Theta Photon cannon.
-In those 3 empty slot you will get Thamium9 QTY 100, Chrysonite QTY:175 & gravitino balls Qty 5....
-Now look at the Gravitino balls it will show 5 out of 100.. move that to your inventory boom now you when u find balls they will stack to that pile
-when selling them ALWAYS leave at least two in the stack to keep stack alive, now when find or purchase gravitino balls u can stack em
This methodm has worked with ALL RARE items that I've use to craft ship items.. Hope that helps