So, I've been playing around with a summoner lately, and my favorite spells to use have been the create pit family. Well, in one particularly scary battle I cast a pit to drop a demon in. Then I cast another one, and another one, and another one. My GM was okay with it, but I've been curious about the legitimacy of my tactic.
You create a 10-foot-by-10-foot extradimensional hole with a depth of 10 feet per two caster levels (maximum 30 feet)...
A number of spells and magic items utilize extradimensional spaces, such as rope trick, a bag of holding, a handy haversack, and a portable hole. These spells and magic items create a tiny pocket space that does not exist in any dimension. Such items do not function, however, inside another extradimensional space. If placed inside such a space, they cease to function until removed from the extradimensional space. For example, if a bag of holding is brought into a rope trick, the contents of the bag of holding become inaccessible until the bag of holding is taken outside the rope trick. The only exception to this is when a bag of holding and a portable hole interact, forming a rift to the Astral Plane, as noted in their descriptions.
You cannot cast Create Pit inside of another Create Pit spell. Your tactic was not allowed by the rules, because extradimensional space do not function in other extradimensional spaces.
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In general, extradimensional spaces don't function inside of other extradimensional spaces. Since the pit you create is an extradimensional space, you can't create another one inside it.
And that also means that when the wizard falls into the pit, he can't pull the scroll of spider climb out of his handy haversack.