Sh.Dibyendu Ghosh Ji,
Your query raises so many questions before final reply is posted. These are :-
1. Whether subsidiary co. is located in India or outside India ?
2. Where is effective use and enjoyment of service ? Where is the beneficiary of the service located ?
3. What is the place of location as per POPS Rules, can be determined only after the reply of above two questions ?
4. Whether it is export of service or not, can be decided only after the above replies ?
5. If ST is applicable, primary responsibility is of subsidiary Co., if subsidiary co. is located outside India then holding company is liable to pay.(being in India)
6. Guarantor is legally bound for all financial liabilities of subsidiary co. Had holding co. not signed as guarantor, even then, it being parent co. and overall in control of all activities of subsidiary co.,cannot brush aside the responsibility of dues of ST department. (pertaining to subsidiary co.)
Confirmed reply can be given only after full facts are known to experts. I do not want to beat about the bush by using 'Ifs' and 'Buts' in imaginative situation.