How to run for particular testcase from a testSuite using command line argument

Use cmd.exe /C to run batch file from powershell

Double quotes should be open before -s and -c

test-project-file: If the file name or path includes spaces, enclose the entire argument in quotes.

Use the TestRunner GUI to create the command line

After you selected a menu command, ReadyAPI displays a dialog box, where you can configure the run parameters. Click Launch button then use that command string to run the utility from the command line.

https://support.smartbear.com/readyapi/docs/soapui/running/automating/gui.html

Command

cmd.exe /C testrunner.bat "-sTestSuite 2" "-cReport_144" "d:\GPS-API\Test Scripts\REST-GPS-soapui-project.xml"

https://stackoverflow.com/questions/8927379/how-do-i-get-out-of-a-prompt-in-powershell-when-i-made-a-mistake