Bleach/dichlor is an either/or thing. I can't think of a reason why you'd need both at the same time, though maybe there could be some weird situation when it would be a good idea.

Normally, you should use dichlor to chlorinate AND add stabilizer. Use bleach once your stabilizer is adequate. Use dichlor later, on an as-needed basis, to add stabilizer . . . and chlorinate at the same time.

If you prefer, you can use granular stabilizer. But it's hard to dissolve, and often costs more -- even at 100% concentration -- than the Sam's dichlor. (Though the In-the-Swim dichlor on Amazon is currently nearly as cheap!)

By the way -- and I need to say this more -- never, NEVER mix pool chemicals. They do fine together once dissolved in the pool. But in full concentrated form, outside the pool? Not so much! Plain stabilizer is particularly bad that way, and will react rather nastily with a number of things, if you are careless outside the pool.