Generally, almost in every online shop, we can see product variations showing as a dropdown. But these dropdowns could be shown as a table.
Before create variations table you should know that
If you select Variation product, you have to confirm, your all Variation is configured properly. Such: there will not support "any attribute" option for variation. eg: no support "Any Size" type variation.
And if enable Variation product, Some column and feature will be disabled. such: Attribute, category, tag Column, Advance Search box.
To create a product variation like above screenshot. Lets follow below this steps:
Click on the "Basics" tab. Spelldown and you will see "Product Type (Product/Variation Product)". From there select "Only Variation Product".