Update for HMC V8.4.0 SP0 and above.
I can't find the manage option, but is the same principle.
Select the partition and view the general properties
All Systems -> PRD1-Server-9119-MME-SNXXXXXXX -> Partitions -> lxpxxxxx -> General Properties
After that select the resource we need to adjust (Mem/Cpu) and click save.
All Systems -> PRD1-Server-9119-MME-SNXXXXXXX -> Partitions -> lxpxxxxx -> Memory
Yes is done !!!!
For
the Virtual Network adapters,is again the same principle, but you need
select the checkbox [X] Show and assign new virtual ethernet adapters
All
Systems -> PRD1-Server-9119-MME-SNXXXXXXX -> Partitions ->
lxpxxxxx -> Virtual Networks -- Button Manage Network Connections
Unfortunately is not possible and images in comments, Chris can you please add some prtsc?