Many people (including me initially) think that you can only add 50 variations to products in Woocommerce. This is not true. You can only do 50 at a time. Just keep clicking “Link all variations” and eventually it will add an amount under 50.
To calculate how many variations you should have, just multiply all the amounts of variations together. So if you have Shapes x8 Colours x7 Packing Types x2 = 8x7x2=112, so you would have to click the “Link all variations” 3 times. First time = 50, 2nd time another 50, 3rd time = 12.