one cable / 2VLANS

Hello,
I’m new on Mikrotik, but I’m very happy to work on it.
I have two RB941-2nD (lite) devices, and I want to use them to separate work VLAN and Guest VLAN.
I have 1 cable to anothe floor, where need to expand company network devices with same two VLANS;s.
I think to use 2nd device RB941-2nD.
How to “transfer” two VLANs with one cable to another Mikrotik “switch”?
Thank you

That’s what VLANs are intended for. This topic explains everything about VLANs, but maybe you should read this one first.

Just connect the Mikrotiks using that single cable and add VLAN interfaces on the ETH interface on both devices.

Something like this:
2021-09-22_153917.jpg

Simple answers only work in simple contexts. Here, only a high-level context has been given in the OP. So your answer may be spot on or it may be completely misleading. But as the OP has stated he wants to expand the same VLANs to other devices on upper floor, I’m afraid it’s the latter case.

Thanks to everyone!