a sub routine in minivend

["Di Zhao" <zhao_di@hotmail.com>]

Hi, I am just wondering if there is a way of writing a named subroutine in 
minivend so that I can call it in different perl code?
My thought comes from this: Sometimes the price scheme is bizaare so I
decide to reimplement the subtotal tag by my own scheme(define a user tag 
named subtotal). Then I have to reimplement tags:total, shipping. In every 
tag I have to write the same code to calculate the same price scheme, it 
will make my life much easier and happier if I can find something that I can 
define a sub total_amount() in the catalog.cfg and call it in my 3 tags. Is 
there a way to do this? Or am I wrong from the start?

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