macro for set distance line selection

[wadih]

Dear list members,
I'd like to ask for help either developping or indicating an existing macro that allows me to, after I choose a line selection on an image, select  parallel lines a set distance away from that initial selection. Basically I would place the initial line and then require the macre to provide line selection a certain pixel distance away.
PS. Can I achieve more than one line selection at the same time?
many thanks in advance for your input,
Wadih

 
     
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