So basically you just want apps2sd .apk file that you can install on a rooted portal running 2.1
Froyo 2.2 had this ability built in I believe, so you don't need to install apps2sd, but I dont think there is a stable 2.2 firmware available for the portal.
Just search for apps2sd to find a link to the dev's site, or read beerkans rooting guide as it has the links you need in it.