The argument for naming the table is Output Table().
dt=open("$SAMPLE_DATA\Big Class.jmp");
dt << Split(
Split By( :sex ),
Split( :height ),
Group( :name ),
Output Table( "my split table" ),
Remaining Columns( Drop All ),
Sort by Column Property
);
There are three ways to learn this.
1. Perform the Split interactively, using the option in the Split dialog to name the output table and then examine the Source script in the resulting table.
2. If you have JMP 16 or greater the Enhanced Log window will show you the script.
3. The Help->Scripting Index entry for Split shows the syntax.
-Jeff