How do I abbreviate cash above Billions in Zednov's Tycoon Kit?

So in Zednov's tycoon kit, theres a script called settings. This abbreviates 1,000 cash into 1K and 1,000,000 into 1M, and 1,000,000,000 into 1B. But there is nothing above that. I'd like for someone to help me with making 1T, 1Qd, 1Qn, to like De or something. I would love to know how to do this since the script looks confusing as hell and I have no idea how to script:

Script:

function module:ConvertComma(num)
	local x = tostring(num)
	if #x>=10 then
		local important = (#x-9)
		return x:sub(0,(important))..","..x:sub(important+1,important+3)..","..x:sub(important+4,important+6)..","..x:sub(important+7)
	elseif #x>= 7 then
		local important = (#x-6)
		return x:sub(0,(important))..","..x:sub(important+1,important+3)..","..x:sub(important+4)
	elseif #x>=4 then
		return x:sub(0,(#x-3))..","..x:sub((#x-3)+1)
	else
		return num
	end
end

function module:ConvertShort(Filter_Num)
	local x = tostring(Filter_Num)
	if #x>=10 then
		local i
		local important = (#x-9)
		return x:sub(0,(important)).."."..(x:sub(#x-7,(#x-7))).."B+"
	elseif #x>= 7 then
		local important = (#x-6)
		return x:sub(0,(important)).."."..(x:sub(#x-5,(#x-5))).."M+"
	elseif #x>=4 then
		return x:sub(0,(#x-3)).."."..(x:sub(#x-2,(#x-2))).."K+"
	else
		return Filter_Num
	end
end

return module

--End of script

As you see, theres only K+, M+, and B+... I need higher ones...