A conventional combined washer-dryer uses one drum for both functions, so it cannot wash one load while independently drying another inside that same drum.
Understanding this situation
This practical difference affects household planning compared with separate appliances. A long drying stage occupies the washing drum, and pausing it to insert fresh dirty laundry would mix different stages rather than create a second wash chamber.
A useful next step
Plan compatible loads and allow the chosen programme to finish safely. If you need to wash another load urgently, do not force a hot or locked door or bypass the cooling stage. Use another appropriate laundry arrangement until the drum is available.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.