So just to clarify what I will do :
Delete price column from products table.
I have created a Price table setup as follows:
PriceID (pk), SizeID, ProductID, Price
'Add to cart' button is on product detail page however I am not entirely sure how to make options in size table available in 'add to cart' in Ecart.
DO I just follow wizard again?
Then create php code which checks if ecart form posted.
Not sure how to do . I think I have to start with something like this
Create a mysql_query which selects correct price based on customer selection from Price table .
Finally insert price into Ecart array (not sure how to achieve but will definitely give it a go)