Hi Haill44,
If the master node receive a Meter.Watts Value for one node, the parameter will be created automatically.
With your equipment if this Parameter is not created it means that HG doesn't receive it.
I see that sometimes some equipment send Sensor.Power instead of Meter.Watts.
And an other reason to not receive the data is that the default parameters of the equipement is not set for that. You have to read the datasheet you receive for know thow to do this.