You can write your topic however you want, but you need to answer these questions:
What do you want to achieve? Keep it simple and clear!
Spinning my carousel without having to individually welding each part
What is the issue? Include screenshots / videos if possible!
There’s so many parts that it would take a long time to weld each individual part to a part
What solutions have you tried so far? Did you look for solutions on the Developer Hub?
I haven’t tried anything but I’m thinking can I group everything then tween a primary part to spin?
After that, you should include more details if you have any. Try to make your topic as descriptive as possible, so that it’s easier for people to help you!
No code
Please do not ask people to write entire scripts or design entire systems for you. If you can’t answer the three questions above, you should probably pick a different category.
You’re on the right track, you could group it all together, designating a PrimaryPart. Then tween an IntValue’s Value from 0-360, with a .Changed event listening to that IntValue wherein it calls [model]:SetPrimaryPartCFrame([...]) where you’d re-angle the PrimaryPart along the axis you want using 0-360 as a degree of rotation. Note that this may not be the best applicable solution to your problem, I’m not sure how physics would handle players standing within the carousel when its part is being CFramed. May be compensable by teleporting the players touching it along with its movement, but that’d be trickier.