Short position in cash

I had read somewhere that any analyst given sell call of some script at 860 on 14 sep and now give book profit call at 700 on 25 sep. How it is possible to hold a short position overnight as I only know that short position is to square off same day other wise it will be auctioned.
Is it any how possible to hold short position in cash over night??
Please explain…

I guess there were recommending Futures selling.