Macro to take the data from one sheet and add it to another

[Michael D]

Hi Guys,

I'm working on spreadsheet to track my sales on Amazon.com. In doing so, I need to create a single worksheet (called "Ship Master")that lists every sale I've ever made. I am able to generate reports on Amazon's website which lists all of my sales for a given period (up to 30 days maximum), which can then be copy/pasted into my workbook.

In theory, if I was very vigilant in selecting the dates I chose to download, I could simply copy/paste the data right into the end of the "Ship Master" worksheet, but mistakes could lead to redundancies and errors in my data.

What I'm looking to do is to download a report from Amazon, and after deleting any old data from the "Ship Import" sheet, pasting the fresh data into it.

From there, I'd want the macro to look at the newly pasted data in the "Ship Import" sheet, and copy any new sales into the "Ship Master" worksheet. Both worksheets have identical headings. There is a unique identifier in column D of these work sheets called "shipment-item-id". This identifier is what the macro is going to be checking for when it determines whether or not the data should be appended to the "ship master" worksheet.

I've attached a sample workbook with the 2 worksheets and some data in them.

Thanks in advance guys!