Remove character strings

[#1]

I have this column SAMPLE where I need only to retain the code inside the () but somehow, I cannot remove the Column% word and the parenthesis. I tried using Word(2,:SAMPLE) but it only returned an error. 

How to remove the word Column % and the parenthesis from the string?

[#2 · Accepted solution]

Using Word seems to work fine for me

Names Default To Here(1);

dt = New Table("Untitled 18",
	Add Rows(1),
	Compress File When Saved(1),
	New Column("S", Character, "Nominal", Set Values({"COLUMN %(AC353)"}))
);

dt << New Column("", Character, Nominal, Formula(
	Word(2, :S)
));

Could you provide the datatable instead of an image? Also changing the separator to () instead of " " (default) might work

	Word(2, :S, "()")

[#3]

Attached file is the sample data table. What I want is that only AC353, AEE67 and so on would be the only values of the column sample.

[#4]

Formula I provided with "()" should work, just replace :S with correct column