My script:
t = { tier= {}, cframe = {} }
Is there a way to inset a value in the 'tier' table using table.insert?
Of course. Things inside tables are just normal values, so you can do anything to them that you can do to any value.
local cframes = t.cframes table.insert( cframes, CFrame.new() ) -- or, more simply table.insert( t.cframes, CFrame.new() )
One of the main goals of a programming language is to provide consistency. With only a few exceptions, code that works in one place in Lua works anywhere in Lua.