Macro To Roll Down Values

I have been supplied a spreadsheet (see attached example sheet) which contains data on a project I am working with. Essentially the guy who has supplied me the data has been lazy and only provided values once within the sheet which makes filtering extremely difficult. I have made the cells on the sheet A3:F23 in the format I ideally require. Cell A26 onwards is the format in which the data is currently supplied to me.

Column A (Box No) should roll down the same value until the value changes, where a blank row should be left as already exists and the same process of roll the value down until it changes, leave the blank line and then roll down the next value. This should continue until the data ceases at the end of the sheet - I have made the example sheet short but there are tens of thousands of box numbers. Columns B (Box Type) and C (No of Bundles) should also remain constant where Box No remains the same and should be rolled down until the value of column A (Box No) changes.

Finally column D (Bundle No) should be rolled down independently of A,B,C and needs to change whenever a new value appears within the sequence for column D. Again when this changes the blank row should be left and then the new value rolled down until it changes again. I have tried in vain to try and create a macro within Excel to do this but have failed miserably.