Taxing of foreign subsidiary

Dear all,

I have a doubt on the tax implications for income earned by a foreign subsidiary.

A ltd has a wholly owned subsidiary B ltd in singapore which is carrying its operations there but the management vests with A Ltd (means directors, resident in india, of both the company is same). In such a scenario, what will be the tax implications on the income earned by B ltd. Is it required to file a return of income in singapore and India

What will be the implications if B Ltd was not a subsidiary but a branch  office ??

Regards

Mukesh