I bought a 18' x 36' x 48" tall Doughboy ag pool from a distributor in the Dallas area. I had the pool set 2' into the ground and had a deep end - about 5 1/2' to 6' deep for maybe about a 12' x 15' area, gently sloping from one end - put in. A contractor did the work.

I really don't have any idea if the liner was specific for that particular setup. You might try calling the online stores - it would appear that at least you can do it with Doughboy pools.