combine multiple pdf into one through bursting

Summary: need to combine multiple pdf into one through bursting

Content (please ensure you mask any confidential information): We currently have a report with bursting set up to send 600+ individual pdf to each employee. Now we want to have the bursting to produce one single pdf that combined all 600+ pdf into one. We used the feature 'include all files and send one single email' option under bursting definition but got the following error message. So we decided to split the results into smaller groups. However, there's no other Bursting POV allowed under bursting definition. Is there a way to add additional dimension in Bursting POV?