Not sure what you mean with own model.
When you want that the user is able to add to the combobox only text which follows your specific rules, you may use a QValidator.
Just saw the setModel of QCombobox most likely you need to use one of QCombobox signals (e.g. editTextChanged) and add it to the model through your own slot method. However, never used that yet.
Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.