i want to login to my routerboards

hello every one
I’m Distributor for a large internet services company
i have a RB411 for receiving from the company
and RB333 as a broadband server which contain the Broadcast system
and I’m connected to internet by linksys router
when i want to login to one of my routerboards i connect my PC LAN directly to each routerboard by using winbox and i login by mac

how can i login to my routerboards both without disconnecting my LAN from the linksys router

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As far as i understand

PC connected to LAN of Linksys
1 port of RB 333 connected thru RB 411 Ether
1 Port of RB 333 conneted thru Linksys WAN

You can access each by IP.