Make sector bigger or smaler

Example I copy one sector ans shrink it in 32x bigger. This should symetric (32 square and 96 square). How can I do in doom builder2? I dont want create new sector or move linedefs...

Not sure if it's that what you mean...

select all sectors you'd like to be smaller or bigger, press "E" for edit mode and scale that whole thing....

A quick and dirty way is

highlight the sector and E ( as in 4everDoomed's screenshot}

then click and hold on the handles and drag them out.

Judging by your screenshot, it sounds like you're looking for an "Inset" function: automatically draw a new sector with edges that have been shifted inwards, like drawing a border around the inside of a shape. Unfortunately I don't think Doom Builder has a feature like this. I can't speak for its forks Doom Builder X and GZDB-Bugfix though. edit: See Impboy4's post below!

The Stair Sector Builder plugin from the Doom Builder website has the ability to make smaller versions of the parent sector selected.

http://www.doombuilder.com/plugins/stairsectorbuilder.zip