Depending on your situation, you CAN combine them.
If you just want to have more screens for productivity, like say opening multiple documents/spreadsheets and web browser windows at the same time, you can use IGPU Multimonitor (it's a setting in your motherboard).
If your motherboard supports it, you can use your Intel chipset outputs as well as your GT610 outputs to connect more screens to your PC.
If you meant for gaming however...you're outta luck there. In the first place, the GT610 is a really weak gaming GPU. Your Intel IGPU might even outperform it.