Error When Passing Parameters across Multiple Forms in C#

Question

I am trying to pass a parameter across from Form 1(POS form) to Form 2(Summary Form) but when I declare the variables in Form 2(Summary Form), two errors pop up saying that "There is no argument given that corresponds to the required formal parameter" in Form 3(Inventory form) and Form 4(Main form). 

 

How do I solve these errors?