Hi @chandan.kumar,
As you said, it still can be clickable by using Action Builder. So I would suggest you try to click in this way (using Action Builder in Katalon).
import org.openqa.selenium.WebElement
import org.openqa.selenium.interactions.Actions
WebElement submenuItem = Windows.findElement(findWindowsObject('Object Repository/Mic 01/Submenu_Item'))
Actions builder = new Actions(Windows.getDriver());
builder.click(submenuItem)
builder.perform()
And about the submenu item object, maybe you have to write its locator on your own, as both Windows Recorder and Native Windows Recorder were not able to capture it.
~ Hope it could help! /=)
