In this case, you can create one folder, say, "VeeamZIP VMs" and specify it as a source for the file copy job created via GUI. This folder will be used as a place to where given VMs are VeeamZIPped.
As to the scheduled script, its algorithm might be as following:
1) Input VM name. ($VMname = Read-Host 'What is VM name?')
2) VeeamZIP the given VM. (Start-VBRZip)
3) Execute the file copy job. (Start-VBRJob)