You can go with parameterization
For parameterization you need to create a js file
For example, the Js file contains
var username = ["parameterization1@mailinator.com", "parameterization2@mailinator.com"); var password = ["parameterization1", "parameterization2"];
You can load this JS file in Options> Options ...> General tab> Selenium IDE extension.
Example script for parameterization

Rohit ware
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