The problem that I'm having is stated on the subject. I tried:
adding rectangle to my artboard > Object> Path> Split into Grid but I'm not sure what to do next.
I rarely use Ai as I usually edit with Ps and the export settings is very different from each other
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If you have to rectangles that have the size you want for the separate export, select them and choose: Object > Convert to Artboards.
You can delete the larger artboard if you want.
Got it! Thanks Tom
Good to hear that helped.