Use the Place Junction option to add what will be “terminals” for your sub-circuit
Drag across circuit cutting across connections that will serve as inputs or outputs of the subcircuit Cutting across a connection
To see the details within the subcicuit, right click on the subcircuit, choose Properties, then click Edit HB/SC
Back on the Design tab. To change location of connectors on subcircuit, return to original tab page, right click and choose Edit Symbol.
To use subcircuit in another file, highlight “internal” version of subcircuit (notice tab)