Two ISBs

hi everyone,
i have CCR1016-12G and i have the main isp (7Mb) at port 1 and the second one (3Mb) at port 6, i want to useload balancing between the two ISPs and use them simultaneously.
I also want to force users with this range 192.168.70.x to use the second ISP (on interface 6).
is this possible using WinBox?
thanks in advance