If you have two sheets in a workbook: Sheet1 is for summary and Sheet2 is for the raw data and you need to update/insert/copy data in Sheet2 to Sheet1. Below is the incorrect sample macro code:
Selection.PasteSpecial Paste:=xlValues, Operation:=xlNone, SkipBlanks:= _
This code will work, but everytime you change data in Sheet2 the Sheet1 will only replace its data. But what you are probably looking for is that everytime you change data in Sheet2, it is also added (append) in Sheet1.
You need to know the last row used. In this case Range("B283"). Select finds the last used cell in column B and then select one cell below it:
lMaxRows = Cells(Rows.Count, "B").End(xlUp).Row
Range("B" & lMaxRows +1).select