…nothing happened. As you said, some of the old styles are not available. It depends, how my source is formatted therefore, when I copy text from source to Template file, some unused styles don’t get copied to the Template. I think that’s the problem.

Any suggestions would be much appreciated.

Thanks Colin for the inputs. I tried it but it seems there’s something missing.

I think I have ordered the script correctly.
The script just applies the myTableStyle but didn’t remove the overrides completely.

Secondly, I need a script to do as:
1/ Apply the myTableStyle style to the current table. By current table I mean the table with Cursor in it.
2/ Format the table with Alternate Fills (the existing style do not have the Alternating Fills, I am not supposed to edit it).
2.1/ First 1 Row : Color: None
2.2/ Next 1 Row : Color: Black 20%

And another script to:
1/ Apply the myTableStyle style to the current table. By current table I mean the table with Cursor in it.
2/ Format the table with Alternate Fills (the existing style do not have the Alternating Fills, I am not supposed to edit it).
2.1/ First 1 Row : Color: None
2.2/ Next 1 Row : Color: Black 20%
3/ Convert the the first row to header of the current table.


app.doScript(checkUserSelection, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, "Process Table");

function checkWhichTable()
{
// ensure the user made a selection
if (app.selection.length != 1)
return null;
var currentTable = app.selection[0];
if (currentTable.hasOwnProperty("baseline"))
{
currentTable = app.selection[0].parent;
}
while (currentTable instanceof Cell || currentTable instanceof Row || currentTable instanceof Column)
currentTable = currentTable.parent;
if (!(currentTable instanceof Table))
{
// No table selected
return null;
}
return currentTable;
}