Extrude new solid but new solid part not appear

[naimkhairi_beton]

hi i have extrude new solid on my part. but the new solid not appear. 

[WCrihfield]

Hi @naimkhairi_beton.  I think you will need to include more details about this situation, so that we can better understand what is going on, and possibly offer better quality help.  If you could include screen captured images or video of what you are doing, and the result, that may help us understand also.