Run as admin Powershell window, run as other user
So if you've already entered credentials to run a Powershell window as a different user, but you still need to run an elevated, i.e., run-as-administrator, prompt, you can type this command in.
Start-Process powershell -Verb RunAs
Alternative
But if you've not done anything yet, and want to open a cmd.exe prompt (notably, not Powershell!) to then kick off such a process:
%SystemRoot%\System32\WindowsPowerShell\v1.0\powershell.exe -NoProfile -WindowStyle Hidden -Command Start-Process -Verb RunAsUser $PSHOME\powershell.exe '-NoProfile -Command Start-Process -Verb RunAs \\\"$PSHOME\powershell.exe\\\"'; Start-Sleep 120
Reference:
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