Payroll in controlling

Hello Friends,

I am FICO consultant and have no much idea about Payroll functionality. One of my clients are interested in knowing how can we have the controlling area set up for their different company codes under single client.

A single controlling Area defined over all the company code is suggestible or having different controlling areas created on multiple company code basis? As the organisation would like to have the control of all the company codes in its Head office level only and the payrolls are posted into various company codes by the key user of Head office.

Your inputs will be appreciated if anyone can help me know the payroll's role into controlling module?

Thanks in Advance.

Regards

Jyoti