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I am not able to set up &nbsp;&quot;Manually select custom settings&quot; in the &nbsp;Customization Specification manager when doing in the Web Client. <br />
But I am able to do this when using the vSphere 5.1 Client. <br />
Any Reason why.<br />
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Customization Specification Manager Issue

Customization-Issue.docx

I am not able to set up  "Manually select custom settings" in the  Customization Specification manager when doing in the Web Client. 
But I am able to do this when using the vSphere 5.1 Client. 
Any Reason why.

VM Customization Network configuration

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.