How can I link product color variants on my online clothing store?

Hi All - My Store is www.mydestinyapparel.com.au Im needing help with variants. For Example i have a jumper in 3 different colours. Blue, Purple & Black. I’ve listed these as 3 individual products so they show on the collections list separately. However I am wanting to link these separate listings as a variant on each product ie. The blue also shows an option for the Purple & Black. I’ve tried googling and nothing seems to be working… PLEASE HELP!

Hi, @Nikkibrown your idea is good. now go to each of these products and add two other colors as variants to that one.