Invoice sort

hello, in sales invoice i would like to be able to sort invoices by customer name
or sort by specific date or specific period

also if possible to add attachment to invoice

You can accomplish much of what you ask by sorting the invoice listing. Type in a date and you will get all invoices on that date. Type in a customer name (or even a portion of the name) and you will get all invoices containing that text. This does not give you a date range.

To add an attachment, print the invoice as a PDF and use your PDF viewer to add pages, such as a scan of receipts if necessary.

@lubos has mentioned additional improvements coming in this regard, but these approaches should help until they are available.