[docs] moved into folders

docs/user/setup/docs.user.setup.series.md

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+---
+{
+	"_label": "Creating Numbering Series"
+}
+---
+Data records are broadly classified as “Master” or “Transaction”. A master record is a record that has a “name”, for example a Customer, Item, Supplier, Employee etc. A Transaction is a record that has a “number”. Examples of transactions include Sales Invoices, Quotations etc. You make transactions against a number of master records.
+
+ERPNext allows you to make prefixes to your transactions, with each prefix forming its own series. For example a series with prefix INV12 will have numbers INV120001, INV120002 and so on.
+
+You can have multiple series for all your transactions. It is common to have a separate series for each financial year. For example in Sales Invoice you could have:
+
+- INV120001
+- INV120002
+- INV-A-120002
+
+etc. You could also have a separate series for each type of Customer or for each of your retail outlets.
+
+To setup a series, go to:
+
+> Setup > Customize ERPNext > Numbering Series
+
+In this form,
+
+1. Select the transaction for which you want to make the series
+The system will update the current series in the text box.
+1. Edit the series as required with unique prefixes for each series. Each prefix must be on a new line.
+1. The first prefix will be the default prefix. If you want the user to explicitly select a series instead of the default one, check the “User must always select” check box.
+
+You can also update the starting point for a series by entering the series name and the starting point in the “Update Series” section.