removing a stair case
Welcome Superbeef83, to the best darn DIY'r site on the web.
You should post some pic's of the stair to be removed to help understand the existing structure. Many times the stair opening is framed in a way to support the stairs and there may be a possibility that you will not have to add any support posts, but without a visual there is no way of making any additional comments.
If you think you need to add posts a structural designer or engineer would be a wise choice to ensure that the integrity of the area is not comprimised.
When its all said and done there is usually more said than done
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