<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />What is the fastest way to transform Table 1 to Table 2? I appreciate if you can elaborate the steps. Im a newbie in JMP.

What is the transformation you are using to create Table 2? It looks like you may be repeating rows A and B, but it is unclear to me how you get the rows labeled C in Table 2.
To achieve the repeated rows, one way to do this is by using the Concatenate function, and then concatenate Table 1 to its self 4 times, and then sort by the first column. An example script is below. This may be achieved without scripting by using the Concatenate and Sort functions from the Table menu.
// Example
Names Default To Here( 1 );
// Create table1.
table1 = New Table( "Table 1",
Add Rows( 3 ),
New Column( "Table 1", Character, Nominal, Set Values( {"A", "B", "C"} ) ),
New Column( "X", Numeric, Continuous, Format( "Best", 12 ), Set Values( [1, 2, 2] ) ),
New Column( "Y", Numeric, Continuous, Format( "Best", 12 ), Set Values( [2, 2, 2] ) ),
New Column( "Z", Numeric, Continuous, Format( "Best", 12 ), Set Values( [3, 1, 1] ) )
);
nn = 4; // Times to repeat table1.
tt = Repeat( List( table1 ), nn ); // Create repeat reference.
table2 = table1 << Concatenate( tt, Output Table Name( "Table 2" ) ); // Create table2.
Column( table2, "Table 1" ) << Set Name( "Table 2" ); // Change column name.
table2 << Sort( By( :Table 2 ), Order( Ascending ), Replace Table ); // Sort table 2.