I have an MS Word document in English language and I want to insert line numbers to the left and right margins of my document. Inserting the line numbers on the left margin is straightforward and works perfectly but on the right margin is not working. I would appreciate it if someone could kindly help me in this respect.

Also, line numbers appear as 1,2,3,…. but I need them as LN001, LN002, LN003,…

I will be so grateful if I get some guidelines on this matter as well.

Thanks a lot