Merge internet lines

Hi,
Good Day,
I have a customer have  five internet lines with 8Mbps,
He want to merge the five lines to  appear as 40Mbps, Is this possible ?
If yes,He want make traffic shaping on 40Mbps In which assign 16Mbps for specific subnet and 12Mbps for another subnet and so on, Is this possible?
If yes, Is there any document tell me how to configure both ?

Thanks in advance.