I am using the following to construct a command that can take optional arguments.

I wonder how users could change the value of "\vamt". Not quite sure whether the use of "\setlength" would be appropriate.

You have again posted a multiple-duplicate question after being warned and previous threads having been closed, here and here, the original having been posted here which is receiving active, quality replies.

As such you are attempting to circumvent those previous closures, contrary to the LQ Rules:

Please do not do this again.

This thread is being closed, again, as a duplicate. If you continue with this behavior you may be banned from participation on LQ temporarily, or asked to seek help elsewhere.

Please consider this a friendly, but firm warning to cease this behavior.

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