The program in the Product Sales.xlsm file from the previous chapter (see Example 9.2) is written as a single sub. Break it into at least three shorter subs, all called from a Main sub. You can decide how to break it up and whether you want to use module-level variables or pass arguments.
Keeping Track of Products Sold A company keeps a spreadsheet of each sales transaction it makes. These transaction data, sorted by date, are listed in columns A to C of the Product Sales.xlsm file. (See Figure 9.5, which has many hidden rows.) Each row shows the four-digit code of the product sold, plus the date and dollar amount of the transaction. Periodically, the company wants to know how many separate products have been sold, and it wants a list of all products sold, the number of transactions for each product sold, and the total dollar amount for each product sold. It wants this list to be placed in columns E, F, and G, and it wants the list to be sorted in descending order by dollar amount.
Figure 9.5 Transaction Data
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