You haven’t specified how you want to combine the data in the columns, but these two examples (run in JMP 9) may help you sort out the syntax you need:
Alist = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J"};
dt = new table("DT",
new column("Label", character, values(AList)),
new column("Kurtosis", numeric, values([2, 4, 6, 8, 10, 2, 4, 6, 8, 10])),
new column("Speed", values([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]))
);
dt << new column((column(dt, 1) << get name) || " (" || (column(dt, 3) << get name) || ")",
numeric, formula(:Label || "-" || char(:Speed)));
dt << new column((column(dt, 2) << get name) || " (" || (column(dt, 3) << get name) || ")",
numeric, formula(:Kurtosis * :Speed));
// You can't delete the first column yet, because it's used in one of the formulae above;
column(dt, 4) << delete formula;
// NOW you can delete the first column if you want to;
dt << delete columns({"Label"});
Does this help?