Splitting routes with multiple NICs

If 192.90 means that all company addresses start with that then it's easy: remove the devault gateway from your Broadcom NIC, add a route for all intra-company traffic and let the rest use your 4g card with a default route:

route add -p 192.90.x.x mask 255.255.x.x <ip-company-gw>

Many 3G/4G providers have been spec'ing drivers for the devices that give them a metric of "1" so you cannot override the routes as mat1458 proposed.

PLUS many of them are also disabling all other network adapters while they're plugged in, to keep you from sharing the connection using windows internet connection sharing (ICS)... which would also work against what you want to do.
So if simply adding another line to the routing table doesn't make it work, you need to do some testing first to see what's going on.
e.g. run route print from a command prompt window while the 3G/4G card is plugged in and note its metric on the right.
While the 3G/4G card is plugged in try printing to a network printer there at your company, to see if your computer's other network adapters are disabled.

If 192.90 means that all company addresses start with that then it's easy: remove the devault gateway from your Broadcom NIC, add a route for all intra-company traffic and let the rest use your 4g card with a default route:

route add -p 192.90.x.x mask 255.255.x.x <ip-company-gw>

By doing this, how are you defining the statement to apply to only the broadcom NIC and not the 4g card if they are both active?

If you choose the IP address of the gateway that you right now see on the default route that you get from the Broadcom NIC you should be fine. (route print; search for a route with 0.0.0.0 mask 0.0.0.0; if unsure post route print).

Thanks Mat, here is the route print.
route-print.jpg

You already seem to have a manual static default route set that goes out of the wireline adapter. I'd remove that one first and replace it with a more detailed route (first make sure that all your company's IP addresse are in the 192.90 range!):

route delete 0.0.0.0
route add -p 192.90.0.0 mask 255.255.0.0 192.90.60.1

Thanks Mat for your helpful reply. I am fairly certain this is the range used for the entire company.  To reverse this method, do I do the same command but in reverse, or is there an easier command to restore the original stack?

route delete 192.90.0.0
route add - p 0.0.0.0 mask 255.0.0.0 192.90.60.1    ?

Also, if my 4g card was not connected and I entered the original statement you suggested, would that mean I could not do anything with the wireline adapter except hit company file shares and access internal company websites?  In other words, internet surfing is not happening once this command has been entered and no other network adapters exist?

Hi Mat,
I tried doing what you said and I did not get correct results.

route delete 0.0.0.0
route add -p 192.90.0.0 mask 255.255.0.0 192.90.111.1  

BTW - 111.1 is the correct gateway, not 192.90.60.1.   For whatever reason, there were 2 gateways set, so I removed the 192.90.60.1 as it was not needed.

After putting in this command, I was unable to get to internal connections. I could not ping anything on the 192.90 network.

Is there anything I'm missing here?

Sorry to hear that. Then I wonder what 192.90.60.1 is. Since it seems to have some importance to your traffic.
Can you repeat the route print and add an ipconfig /all and add all in text format so we can see the configuration of your system? Then the recommendations might be more accurate.