can user is able to give manual input while running selenium IDE script?
For ex. If there is name field then can we open input box everytime script runs so that user can give hi
Since you specifically asked about Selenium IDE, the answer is no. But you can pause the script and let the user type their name, then have the script continue. I've heard of folks using this technique for handling CAPTCHAs, which of course are not easily automatable.