list saved variables?

[Wadsworth]

currently my addon saves data in this format:

CritLockData = {
	["Data"] = {
		["Searing Pain"] = {
			["Norm"] = {
				["Level"] = 41,
				["Damage"] = "165",
				["Unit"] = "Starving Blisterpaw",
			},
		},
		["Death Coil"] = {
			["Norm"] = {
				["Level"] = 42,
				["Unit"] = "Glasshide Basilisk",
				["Damage"] = "349",
			},
		},
	},
}

what i need to do is list all of the attack names currently saved as headings under "Data" in a combobox. unfortunatly, i have no idea how to do this and can seem to find an idea anywhere.

is there a way i can get how many headings are under "Data" and then add them to a combobox? the headings arent pre-determined so i dont know how many headings there will be or what they will be called.

any info would be greatly appriciated. thanks in advance.