If you are using Communication of external documents, you can use a document type to indicate that documents should always be added as attachments to one or more reports. When a document link is created, the settings are automatically copied from the document type of the document.
Example
The document 'Maintenance plan' must always be added as an attachment to particular sales reports. The document has the document type 'Sales attachment'. Documents of this type are to be sent as attachments to the sales offer and order confirmation. If you link the 'Maintenance plan' document to the sales line by clicking the Documents button, the settings will be copied from the document type. When the sales offer or order confirmation is sent, the document 'Maintenance plan' will be added automatically. The attachment sent is listed on the Documents sent form.