I have around 800 items on a plan, and I would like to assign a number to each one of them. Is there a "stamp" feature? Right now I am writing manually copying and the editing the text. 

If there is such an option - can I customise it? e.g. I would like it to be 2/x - where X is count number, then after some time 3/x, where X starts from 1 again.

Thank you in advance,