List post of child categories of parent category.

Hi There guys!

Hopefully you can help, I’m stuck with this!

I have a custom taxonomy, for a custom post type that handles meeting agendas and minutes.

I have a page template which loads these in but I’m after an interesting layout.

I need it to look like this (hope this makes sense)

PARENT CATEGORY (YEAR)
CHILD CATEGORY (MONTHS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
CHILD CATEGORY (MONTHS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
CHILD CATEGORY (MONTHS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)

PARENT CATEGORY (YEAR)
CHILD CATEGORY (MONTHS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
CHILD CATEGORY (MONTHS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
CHILD CATEGORY (MONTHS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)
post from child category (INDIVIDUAL MEETINGS)

Hope that makes sense guys, any help is appreciated!