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Patterns are saved automatically when you edit them. You have to save a pattern only if you mean to modify it and later come back to the original version by loading it.
Patterns are linked to a kit. If you move to a new pattern it will be linked to the last kit you were playing ( very useful when you want to make different variations of a pattern).
If you want to start with a blank pattern AND a blank kit, you have to move to an empty pattern AND THEN LOAD AN EMPTY KIT. the kit you have loaded will be linked to the pattern and you can start programming it. Just remember to save the kit when you have finished editing it, or it will be lost at the next power cicle if you have moved to other patterns/kits, as the A4 remembers only the last active page when you switch it off without saving kits. As stated earlier no need to save patterns unless you mean to do some live pattern editing and then get back to a previous state. Hope it helps.