Use the Beam Cross Section-Beam Coupling to transfer the cross section data from a Beam Cross Section interface to either a Beam Interface or a Pipe Mechanics interface. You need to use one such Beam Cross Section-Beam Coupling node for each type of cross section.

The Beam Cross Section-Beam Coupling node is only available with some COMSOL products (see https://www.comsol.com/products/specifications/)

Select the boundaries that represent the current cross section in the Beam Cross Section interface. This means that the selection should be identical to the selection in a corresponding Homogeneous Cross Section node.

Select the Beam Cross Section interface to couple.

Select the Beam interface to couple. This can be either a Beam interface or a Pipe Mechanics Interface.