Shahnawaz,

Maybe I did not understand correctly your question, but in cals tables a different tabstyle is called in either the <table or <tgroup element:
  <table tabstyle="something"> or <tgroup tgroupstyle="something">
In CSS in order to make cals tables work you need to import either the 'cals_table.css' or the 'cals_t5.css' stylesheets into your CSS stylesheet to make cals tables work.
(in XPP 9.1 we stopped using macros to support the cals table model)

With either of those stylesheets imported, the tabstyle or tgroupstyle attribute will work and call out a different table style for that particular table.

Thanks Bart for answering my question

No problem...but more important: Did it help to solve your problem?

Yes now I am able to call different table specs by adding <table tabstyle="something"> but it is not working at <tgroup ..> level 

According to the doc in "Mastering tables"it should

I assume you have imported the cals_table.css which says:

And that you have the cals_tgroup macro still sitting in your xy_sys in your Lsyslib (or somewhere else should you have copied things over):

If you find all this to be true and the tgroupstyle attribute is not doing anything when added to the tgroup element, you better open up a ticket with support...

Sure Bart, I will check as per your advised and if needed I will open ticket with support.

Thanks once again.