Delete Column

[#1]

I have 190+ columns and I wanted to delete columns stored in the list

Remain_columns = { column names I want to remain}.
How do I do it using for loop?

[#2]

You do not have to loop through the names.  That is, assuming you want all of the columns named in that list to be deleted.  Below is a simple example 

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/big class.jmp" );

namesCol = dt << get column names( string, continuous );

dt << delete columns( namesCol );