Blogger vs WordPress Blog

My plan is to reduce my blog padronel.net drastically by eliminating the entire chapter "DE OTRAS FUENTES" (+12,000 posts).

However, if I export the remaining posts —that is, the entire chapter "DE MI COSECHA"— the resulting file will be a lot greater than the 15 MB allowed for importing to WordPress.com.

So, I've 3 question about:

1) Is there any tool that allow me to export from WP.org and import into WP.com —where I already have padronel-wordpress.com blog with the categories I want to keep—, all the padronel.net remaining stuff —posts, comments, total visits per post, and whatever be exportable—?

2) Is there any tool that allow me to that but category by category?

3) If answer to the two above questions is NO, what the solution would be for me?

The blog I need help with is padronel.net.