change 4 flaps (details and description)

hello

I have a question.

its system of organization has 4 flaps, they say: Full Description, details, contact and comment.

the thing is I do not want to have those four tabs just want to join, and have put together the first two one after the other, I want the details appear below MAP or description.

I made a scheme as could be.

I hope you can help me to know that I must move,

Greetings.