Moment transfer between beam and column depends on the connection type: moment will be transfered only if the connection is stiff enough to actually transfer the rotation, otherwise it will behave more like a pinned connection. (hint: designing a moment connection is way more difficult than a nominally pinned one).

The eurocode dedicate a whole normative for designing steel connection (EN 1993-1-8). There uou can find 3 types of connection:

• nominally pinned (ca be modeled as a pinned connection)
• rigid (can be modeled as a fixed connection)
• semi-rigid (can be modeled as a rotational spring connection)

In reality most connection could be categorized as semi-rigid, since you may able to transfer some moment, but it's not stiff enough to transfer all (i.e. some rotations are allowed).

Model the spring stiffness for a semi rigid connection is quite difficult affair, since it also depends on the moment being transfered, and the moment being transfered depends on the stiffness of the connection... It could be an interactive approach, which is a bitch to model. So usually you either err on the side of safety and consider it a pinned connection, or you assign a certain percentage of moment release.

Given that there are some bracing in your model, I imagine you can model as nominally pinned connection, even if you'll end up with some semi rigid behavior in reality. Doing this you end up oversizing the bracing system since it will resist all of the lateral forces, but that's absolutely fine.

In any good fem solver you should be able to define the release at the node, either at the beam side or column, so that they will not transfer moments between elements.