Map all output variables will automatically map values or variables from a model to process variables in the process if their names are identical. If there is no process variable with a matching name to one of the outputs of the model it will be created when the model is executed using the name of the output value or variable. Inputs are not mapped at all, so there will be no initial transfer of data from process variables to the other model.
For example, if Map all output variables is selected for a start event that contains a form, the data entered to start the process can be used further in the process by mapping the values from fields within the form to process variables in the process. Process variables can be created during modeling time that use the same name as form fields, or alternatively they will be created automatically once the user task is completed at runtime.