Macro To Format Raw Data From Accounting System

I export raw data from my accounting system each month that I then format for use in another application that uses the data to produce customer statements. I have attached a file that shows the raw data in the first sheet and the formatted data in the second sheet. I recorded a macro while I did the process but I need to change the code to deal with dynamic data as the number of rows may be different every month.

Here are the steps I go through:
1. Clear the first 3 rows and the last 5 rows
2. Copy the totals in the last row of the data and paste them in the first row
3. Subtotal the different categories in row 2 and add a validity check
4. Add a new column A with a formula to add customer numbers on each line
=IF(ISERROR(FIND("00000",B5)),A4,B5
5. Copy the formulas and paste values over them
6. Filter the data to show blanks under the "Doc Date" column, delete all rows
7. Filter the data to show blanks under the "Type" column, delete all rows
8. Filter the data to show "Total:" under the "Apply No" column, delete all rows
9. Turn off filters, format all numbers in accounting format
10. Check the validation at the top to ensure no transactions were deleted