If you need to test a variable for multiple values, you could use the IF statement:

<b>
if /i "%ComputerName%" EQU "ComputerName1" goto found
if /i "%ComputerName%" EQU "ComputerName2" goto found
if /i "%ComputerName%" EQU "ComputerName3" goto found
if /i "%ComputerName%" EQU "ComputerName4" goto found
if /i "%ComputerName%" EQU "ComputerName5" goto found
goto notfound

             <font size="+2"><b>OR</b></font>

for %%f in (ComputerName1 ComputerName2 ComputerName3 ComputerName4 ComputerName5) do (
 if /i "%computername%" EQU "%%f" goto found
)
goto notfound

             <font size="+2"><b>OR</b></font>

for %%f in ("ComputerName1" "ComputerName2" "ComputerName3" "ComputerName4" "ComputerName5") do (
 if /i "%computername%" EQU %%f goto found
)
goto notfound

             <font size="+2"><b>OR</b></font>

If you have a file that contains the values you are searching for, one value per line:

for /f "Tokens=*" %%f in ('@echo %ComputerName%^|findstr /i /g:FileName.txt') do goto found
goto notfound<b></b></b>