Your code has two different variables called bln - one in the sub, one in the function. If you defined bln once at the top of the module (above the sub) then it would exist at the module level and you would have only one bln and therefore could use and reassign it anywhere in the module.

Alternatively, you pass the variable's value back to the sub by changing the commented line in the function to...

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Andrew Lockton
Chrysalis Design, Melbourne Australia