Crossing auto pollen with a fem plant

Just wondering thoughts on crossing some auto pollen with a grand daddy purple I got going I got a few clones off it all ready to go into flower was thinking of using some auto pollen to cross with one of the gdp and isolate and make some auto seeds. How think it would work the cross I mean.

Auto with photo = Photo

There's a little bit more to breeding autos. I believe it can take 4 generations to get it squared off to a true autoflowering breed.

Take a look at some autoflowering breeding guides. Here's a decent one that will break it down for you;