Hello, if you use vcenter foundation, you can only see tree esx in the vcenter.
Then in 3.5 you can use the license server to provide licenses to the ESXi, in the ESX you need to change the mode from trial to license server.
hope you helpfull
saludos/regards
____________________________
Ing. Diego Quintana
VCP-VAC-VTSP-VSP
Wetcom Group
Buenos Aires - Argentina
www.wetcom.com.ar
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Ing. Diego Quintana - VMware Communities Moderator - Co Founder & CEO at Wetcom Group - vEXPERT From 2010 to 2020- VCP, VSP, VTSP, VAC - Twitter: @daquintana - Blog: http://www.wetcom.com-blog & http://www.diegoquintana.net - Enjoy the vmware communities !!!