The DGW generates bulk invoices on sales orders, deliveries, etc. You´ll find it within your options in the Avatax module as shown in the image below.

Steps:  

1.  Open the DGW, then choose the target document (the document you want to create), and the parameter by which you want to consolidate the documents. 

2. Select the base document and the posting dates. 

3. Load the documents. 

4. Select the documents you want to consolidate. 

5. Select the bottom next and finish. 

6. Find the column created and see the new invoice