I am in the exact same situation with my WiFi nodes, and I have two of them fed from a CSS106-5G-1S (proper name for the current RB260GS). Here are a couple screen captures:
Open Mesh #1 uses VLAN 201 as it's untagged management LAN, and Open Mesh #2 uses VLAN 101 as it's untagged management LAN.
All the other LANs are sent to the WiFi APs. On each AP, only a couple of the VLANs are used (each VLAN becomes a separate SSID), but I send all the VLANs to the AP and let the AP use the ones that it needs (configured in the AP management). Some time after I took this screen capture, I changed that and only send the VLANs that will be used by that AP to each AP.
BTW, this post really should have been in the SwitchOS section of the forum since it dealt with Switch OS and not RouterOS - however this worked....