how to import symbols into draw

i use draw for plumbing drawings of drains etc is there any i can import

(1) The title of your question makes me assume, that you have some symbols (“shapes” in Draw terminology) and you want to know how to get 'em usable.

(2) The details of you question make me assume you got no symbols (shapes) and you are looking for a resource of symbols (shapes).

Hence what is your real issue?