Blog category in 4 Column is it possible?

Hi,
I love Terra theme. It is great, simple and easy to work with.
However, I could not figure out how to tackle this problem after reading all the documents:
1- I need a page to show blog posts in one specific category in 4 columns (or 3). There are too many posts in this category. I want to show 30 to 40 of the posts with excerpts in one page. How can I do that?

2- An step further, a very nice thing, if I could have is to be able to show four columns each in one category (magazine style)

******* Fearture Post ******
——————————————–
|—Cat1—|—Cat2—|—Cat3—|—Cat4—|
|—Post1–|—Post1–|—Post1–|—Post1–|
|—Post2–|—Post2–|—Post2–|—Post2–|
|—Post3–|—Post3–|—Post3–|—Post3–|
|—Post4–|—Post4–|—Post4–|—Post4–|
|—Post5–|—Post5–|—Post5–|—Post5–|

Could you help me pleeese!
Thank you