I was planning on making a shop gui for a team that team members can decide how much to contribute for an item (say, for an RPG in the starter pack for the team) for example, if there is a team item that costs 1000 points, and billy only wants to contribute 500, he can do that, and lower the price to 500, so when other player contributions stack up to the 1000 total, they can all equip the item. basically, a synchronised shop system that players can contribute to buying something for the team without buying it outright. How would I go about making that gui?