Safari - import selected text/area

it is posible to import only a selected area of a website?

Yes, you could e.g. use the Take Plain/Rich Note services of DEVONthink (see Safari’s services menu).

Also, you can highlight a section of text or an image on a web page and click-hold-drag it to the DEVONthink icon in the Dock, where the clipping will be deposited as rich text in the destination you specified in Preferences > Import > Destination.

Or, if Sorter is active, drag it there and drop it into a destination.

Or, if Display Groups and Tags is open, it will float above all other windows and you can drag clippings to a destination database/group there.