Hi,
I'm still not following you.
"performance of the week" doesn't mean anything precise. The list of orders of the week ? The total amount of sales ? The total number of products sold ? The number of customers ? By best buyers, you mean a list of the best buyers ? How many ? All of them ? Do they have to be sorted alphabetically ? By total amount ?
Note that most of these can already be generated with reports in HikaShop.
And how do you want to put all that in a CSV ? A CSV's role is to have a list of elements (rows) with, for each, a set number of informations (columns).
You can't have at the same time a list of best customers, and a total amount of sales in a CSV. It doesn't make sense. That's why each report in HikaShop is to be configured for a specific data to display, and when you export it, you get that specific data listed in the CSV.
For example, if you create a report of the best customers and you export the CSV, you'll get a CSV with the data on the best customers report.