Image Generator in Input Accel

Hi,
Anyone please help me in the following:

I am using Email Importer to get the batch generated from the email that was sent from a particular mail box, from there I am triggering the Image Generator and then the Index. this is how my work flows.

Actually I need to consider the entire email (Email body + all attachments) as a single document, and index it only once. But the way Image Generator works is that it splits the email into different documents i.e. 1 document(folder) for email body + separate document(folders) for each attachment. Even the Email Importer in the supervisor is showing more than one document(folders) this is before triggering the Image Generator.

Consider an example where an email has an email body + 2 attachments. Number of pages - email body is 3, attachment one is 4, attachment two is 5.

Now my Question is:
Before indexing stage, can I programmatically merge all the 3 documents into a single document. Is it possible?
If it is possible, during indexing, indexer will only see one document with email body and all attachments in a single file (in the above example there would be a single document with 3 + 4 +5 = 12 pages) which needs be indexed only once.

Is this Possible if so where am I suggested to add the piece of code.
If not please do suggest me how to achieve this.

I would be really very thankful for your reply. Thanks in advance.