Copy and paste top row

I have two columns need to modify in huge excel sheet,I have simplified sample file attached.There are multiple lines of data by date in a single cell for each customer input Column A and another column B has single updated information for current status.What I need to do is for each given day copy the singe update from column B to the top of Column A cell to maintain history.There are two many rows here,Is there any easy way around other than ALT+Enter and copy single row and paste.Thanks