[Advise needed] Multiple internet connections

Hi there.

I have a ASG setup, where I have one internet connection (fiber) that is our main connection for all servers and such. Then we have what we call a "Secure" line, from a separate ISP (ADSL), which we are routing through a pfsense right now.

Is it possible to use both of the uplinks at the same time, but only use the ADSL for the "secure" network?

I hope I made myself clear.

Regards,