VBA Code: Do Loop Based on cell values

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I am trying to create a macro that copies and pastes data based on two things. The datediff value I specified and the policy number. There are tons of policy number that are added and changed constantly. Also, is used for multiple rows. So if I wanted to select all the rows with the datdiff column value equal to 2 and with the same policy number how would I do this? I am at a complete loss. Any help would be amazing!