Mail merge help, anything to have merge build a table and populate fields?

1. Mailing account info to multiple clients

issue

2. Some clients have multiple types of accounts


Header fields for every balance

1. client
2. address
3. account type (example: checking, saving, investment)
4. Account number
5. Balance

Example report

Mr. Doe
123 main st

Checking
xxxx123 $20,000

savings
xxxxx321 $80,000


next record

Ms. Bubba
Checking
xxxx999 $10,000
xxxx888 $15,000

Investment
xxxxx777 $175,000

next record

I can't seem to figure out how to dynamically add additional rows or remove unneeded rows.

Can mail merge see two checking records and post each under checking? See no saving account so delete that section.

as of now I'm having to create checking account 1,2,3,4,5....and have "blank" information filled in and then manually delete each blank line.....for over 800 clients we are running this adhoc (once every couple years) mailer.

Hate word!