Copy table contents to another table with exustung content

[Lolzen]

So I've had trouble finding a solution to this on my own.
The idea is to be able to support "plugins" to my addon.

Disregard the unfinished state, as it is primary a learning project for myself.
As seen i have my table named Stylemeter.datamodules here.
Now i want to be able to write let's say a Damage Taken module which may look like something like this:

dt = {
	["Damage Taken"] = {
		["activated"] = true,
			["strings"] = {
			["SWING_DAMAGE"] = {
				"arg12", --damagetaken swing
			},
			["RANGE_DAMAGE"] = {
				"arg15", --damagetaken range
			},
			["SPELL_DAMAGE"] = {
				"arg15", --damagetaken spell
			},
			["ENVIRONMENTAL_DAMAGE"] = {
				"arg13", --damagetaken environmental
			},
		},
	},
}

how can i copy the contents of dt into StyleMeter.datamodules?
I've come across deepcopy functions in my research, but all the do seems to make a direct copy of the table, i want to actually insert these keys and values to an existing one.

Or is my approach here completely in the wrong direction?