HiDoes anyone know if is possible to draw a line starting from the midpoint of itself in Autocad?

Of what possible use would this be?  And assuming the line could start at its own midpoint wouldn't it have to draw a duplicate line over itself to get to the other end?Maybe you have not worded your question correctly.  Try again.

OK I also don't underdtand the use of it but you can eventually use construction lines.Please tell use of the use of it, maybe you want to use the exact reverse direction to for example ALIGN something, I have to admit that it happens sometimes that I have to ALIGN something with existing entities and then roate the thing by 180° for the final use. 

This same question came up just a couple of weeks ago at the AutoCAD Forums -- see:https://forums.autodesk.com/t5/autocad-forum/draw-a-line-from-its-midpoint/m-p/8501301/highlight/true#M962620Kent Cooper2019-01-18 23:16:17