How to remove several posts(thousands) without get crawl errors and get google p

[ariane_gomes]

I have a client that has a domain with more than 120 categories, (wordpress website) this one working like this for many months, but understood that to shoot for many sides not a good thing, so she decided to stay with no more than 20 categories, and all posts of those categories, so I went to check and saw that it was many hundreds of posts! she is determined to delete almost all of them and 100% of the posts contained in these categories.

Well, since I am the admin of her vps, I am responsible for doing this, but I do not know if I am sure how to do this without negatives in SEO

I simply remove google index pages by doing this in robots.txt:

disallow: http://domain-of-client.com/mycurriculum
I would like to know, how to remove these thousands from posts and these categories without getting more million of 404 error in google search?

    Disallow: http://www.domainher.com/food/
    Disallow: http://www.domainher.com/sports/
    Disallow: http://www.domainher.com/healthy
    Disallow: http://www.domainher.com/shoes
    Disallow: http://www.domainher.com/yoga
.... several other categories ..

     with regard to the visitors receive pages of 404, I have resolved with all my client, I use redirect 301 to some page of their choices,  like the page of post categories deleted for example. but this does not leave free of receiving crawl errors 404 in google search    I would like to know how to delete all this, without get all the errors and without being affected by the penalties of google.    I imagine that the url removal tool google works with individual removal of the posts, and this is not feasible to do there,    so if I do from robots.txt, and everything disappears from google index, can I remove all of them without having crawl errors problem? 

If there is a more correct method to do this, please tell me how.

I really appreciate your help.

[MVMInfotech18]

If I face this situation I think I simply told Google to ignore them. So, just wait for some while, it will get removed.

And the 2nd way is If you want to remove crawl errors from Google Webmaster Tool then you should first check whether those errors are "internal server" errors, "Soft 404" errors or "404 Not Found" errors. After identifying these all errors you should give 301 permanent redirections all those error pages to working relevant website pages. After doing these you should fix all these errors from GWT and errors will be removed at all.

[anilkh7058]

Please explain it more..

[anilkh7058]

Nice solution.