thank you for this question.
In general the described behaviour is possible. Connection between HMI and signal in REXYGEN is always one-by-one. You have to introduce subsystem with mask and change the mask parameter via HMI, where the connection string will be as follows:
The masked parameter can be used on as many places as desired within the specified subsystem.
For more information on defining the subsystem mask see:
If you need additional information, let me know.