How to configure policy-based routing of adding a Router

I have used in 2WAN up the current CCR1016. You want to communicate to the router side by adding another router here, add only terminal certain.
I think you can be set using the policy-based routing in this case, but I wonder Is there a way to add without breaking the current setting?

Best regards.

[admin@MikroTik] /ip firewall nat> print 
Flags: X - disabled, I - invalid, D - dynamic 
 0   ;;; Fix for an L2TP src-address bug
     chain=srcnat action=masquerade to-addresses=0.0.0.0 
     src-address=192.168.99.0/24 

 1   chain=srcnat action=masquerade out-interface=21ip 

 2   chain=srcnat action=masquerade out-interface=ether11 

 3   chain=srcnat action=masquerade out-interface=gmobb
 
 [admin@MikroTik] /ip firewall mangle> print 
Flags: X - disabled, I - invalid, D - dynamic 
 0   chain=prerouting action=mark-connection new-connection-mark=21ip 
     passthrough=yes connection-state=new dst-address-type=!local 
     src-address-list=internal dst-address-list=!internal 
     in-interface=internal 
     per-connection-classifier=both-addresses-and-ports:2/0 

 1   chain=prerouting action=mark-connection new-connection-mark=gmobb 
     passthrough=yes connection-state=new dst-address-type=!local 
     src-address-list=internal dst-address-list=!internal 
     in-interface=internal 
     per-connection-classifier=both-addresses-and-ports:2/1 

 2   chain=prerouting action=mark-routing new-routing-mark=21ip passthrough=no 
     in-interface=internal connection-mark=21ip 

 3   chain=prerouting action=mark-routing new-routing-mark=gmobb passthrough=n>
     connection-state=new in-interface=internal connection-mark=gmobb 

 4   chain=prerouting action=accept dst-address=0.0.0.0/0 in-interface=interna>

 5   chain=input action=mark-connection new-connection-mark=WAN1_mark 
     passthrough=yes in-interface=21ip 

 6   chain=input action=mark-connection new-connection-mark=WAN2_mark 
     passthrough=yes in-interface=gmobb 

 7   chain=output action=mark-routing new-routing-mark=to_ISP1 passthrough=yes 
     connection-mark=WAN1_mark 

 8   chain=output action=mark-routing new-routing-mark=to_ISP2 passthrough=yes 
     connection-mark=WAN2_mark 

 9 X chain=prerouting action=mark-connection new-connection-mark=WAN1_mark 
     passthrough=yes dst-address-type=!local in-interface=internal 
     per-connection-classifier=both-addresses-and-ports:2/0 

10 X chain=prerouting action=mark-connection new-connection-mark=WAN2_mark 
     passthrough=yes dst-address-type=!local in-interface=internal 
     per-connection-classifier=both-addresses-and-ports:2/1 

11 X chain=prerouting action=mark-routing new-routing-mark=to_ISP1 
     passthrough=yes in-interface=internal connection-mark=WAN1_mark 

12 X chain=prerouting action=mark-routing new-routing-mark=to_ISP2 
     passthrough=yes in-interface=internal connection-mark=WAN2_mark 

[admin@MikroTik] /ip route> print 
Flags: X - disabled, A - active, D - dynamic, 
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, 
B - blackhole, U - unreachable, P - prohibit 
 #      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE
 0 A S  0.0.0.0/0                          21ip                     20
 1 A S  0.0.0.0/0                          gmobb                    10
 2 ADS  0.0.0.0/0                          163.139.127.183           1
 3  DS  0.0.0.0/0                          163.139.126.194           1
 4 ADC  163.139.126.194/32 210.146.174.157 gmobb                     0
 5 ADC  163.139.127.183/32 1.21.56.22      21ip                      0
 6 ADC  192.168.1.0/24     192.168.1.1     internal                  0
 7  DC  192.168.88.0/24    192.168.88.1    ether1                  255

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