Hi,
For the name of the product you can use product.product_name
And if you want to append two elements together, you can use concat() :
www.w3schools.com/sql/sql_ref_mysql.asp
You can use all these functions.
However, please not that with mass actions, each entry in the hikashop_product table is a different entry.
So it will handle both main products and variants. And so, product.product_name will be the name of the current entry, and if it's a main product it will be the main product name, and if it's a variant, it will be the variant name.
But there is no "tag" you can enter in there to use the name of a variant of a main product while it's processing a main product, or to user the name of the main product while it's processing a variant.
If you want to do that, I'm afraid you'll have to run a real MySQL query via phpmyadmin.