I'm not sure what you mean.. Try re-arranging your english - maybe you get more replies! If what you are asking is whether you can park your domain with another company other than that the one you registered the domain with.. Then my answer is yes, you just have to change the nameservers at your registrar to those given by your chosen parking company - and Vuola!
If you are also open to selling these domains, then I suggest listing them at Sedo. Then all you have to do is change the nameservers at your registrar to be ns1.sedoparking.com and ns2.sedoparking.com. If the domains have any value, there's a chance that someone could offer to buy it that way also. Don't count on it, though, unless your domains are really worth something and get a lot of traffic.