Assigning data table to new name and keep the original data table untouched after processing

[#1]

I'm trying to avoid making changes in my original data table and keep it un-intact when I do some operations

say we have this kind of scenario

<JSL>

for (i =  1, 3, i++, 

        dt_process = data table("dt_original);
        dt_process  << newcolumn("elclassico", character,formula(if (Contains(:club, "BARC") , "Barcelona", "delete")
       dt_process << save("save_my_club"||char(i))
)

After this process when i = 2 it the jsl says to me cannot find dt_original because the name has been changed. 
Why this is happening ?

[#2 · Accepted solution]

Save will change the name of the dataset and you are always using reference to same datatable (dt_original)

Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Big Class.jmp");
show(dt << get name);
dt << Save("$temp\deleteme Big Class.jmp"); // explicit location
show(dt << get name);

You could create subset instead and save that (if you don't need to leave these open, remember to close them)

dt_process = dt_original << Subset(Selected Columns(0), All Rows);

[#3]

thank you very much!