what do you mean with "Licensed Heavy Forwarder"?
Heavy Forwarder hasn't a license.
If you mean that you have a licensed server that you want to use as HF, you can move the license into the License Master and use it with the other licenses.
It's common practice to install a 0 GB license on heavy forwarders used with Splunk Cloud. It avoids the restrictions associated with unlicensed servers.