nested stored procedure call

I would like to know how can I call a child stored procedure from a parent stored procedure. A child stored procedure will return a result set. Like,
return Select * from tblA where colA=@value.

@value will be passed from the parent SP. And in parent SP. I need to loop through the returned result set to do further processing.

The reason I want to have a seperate child SP is that I will need similar functionality in few other SPs. Any other solution will be appreciated.

Thanks in advance.