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Hi Amruta, in the formula field, there is an option insert field click on this option and then select your lookup field name there will open a new pop-up in which you can select what field you want. if it does not answer your question then elaborate your question a little bit more so I can answer your question more specific as I am unable to understand your question completely

There is only one way to solve this equation and that is mentioned here (https://holanurse.com/) in details and try to implement it on your project.