Cook your sausages up the way you like
Allow them to totally cool before continuing.
Take a sheet of plastic wrap and lay it flat on the counter.
Place whatever portion of sausage you will want when defrosting it and put it in the center of the plastic wrap.
Secure the plastic wrap around your sausage so that none of it is left exposed.
Repeat for each portion you have.
Toss all of the wrapped portions into a freezer bag or a freezer safe container.
Put the lid onto the top of your container. If using a freezer bag, press all of the air out of the bag and then close it.
Write the date on your package and pop it in the freezer.