A new continuum can be created by right-clicking the Continua node and selecting New > Physics Continuum.
The new continuum will be given the next logical sequential name such as Physics 2 but can be renamed if required. Manager nodes for Models, Reference Values and Initial Conditions are added as child nodes to the new continuum node. Once the new physics continuum has been created you can proceed to select the physics models for it.
A new continuum can be manually created (and modified) before a mesh is imported into the simulation.