Remove Old For A New Category

Hello Friends, I would like to A Help

Come on.

I’m Helping a friend of mine on the site – More http://www.sabetudo.net have a big problem, the site is in the air for years, and those years were created several categories without needs, I would like to “Remove 5 categories” and No place these 5 Make Only One, may I’ll have many problems, could someone give me a hint how to make this adjustment without broken links occur? Divert the 302 parace not solve my problem, I would definitely remove the former category and passing to 1, and when the User access the post, he will see that in this new category … understand? Friends, I wait and I wish much success to all.