Dynamic variable value based on a value from xml

I have a invoice template and it is for 4 different companies in my organization. Based on the organization I need to have a different value for a variable that adds blank lines to the end of the invoice. Is there anyway to assign a value to variable based on the value of a xml tag.
Thanks

I should have explained better before. I have one invoice template and we want to keep it one template for all companies. Each invoice is run individually, each companies footer is different, I am calling multiple headers and footers based on each company. Since the headers and footers are different I need to be able to add different amounts of lines and the end of each invoice depending on that company. I have accounted for the page break in my logic based on the amount lines the page is long. I just need a dynamic variable that I can assign different values on the fly.
Thanks

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