A) Example Table

  Heading1 Heading2 Main Heading
Subhead1 Subhead2
Title1 Item 1 Item2 Item 3 SubT-1
Title2 Item 5 Item6 Item 7 SubT-2
MAIN-T MAIN-A MAIN-B MAIN-C SubMAIN

B) Same Table, With:

  Heading1 Heading2 Main Heading
Subhead1 Subhead2
Title1 Item 1 Item2 Item 3 SubT-1
Title2 Item 5 Item6 Item 7 SubT-2
MAIN-T MAIN-A MAIN-B MAIN-C SubMAIN