Parameters are already assigned to automation tracks when you open them, according to their order in the parameter list.
Procedure
Result
The parameter replaces the current parameter in the automation track.
Note
Replacing automation parameters is non-destructive. If the automation track contains any automation data for the parameter that you replaced, this data is still available, although it is not visible. By clicking on the name of the automation parameter in the track list, you can switch back to the replaced parameter. On the pop-up menu, an asterisk (*) after the parameter name indicates hidden automation tracks.