Linking an individual term from a vocabulary with all terms from another vocabulary I have two vocabularies/fields, one called Days that has all the days of the week (Mon, Tues, Wedn...) as terms, and another vocabulary/field called Time of Day that has terms (Morning, Midday, Afternoon, Evening, Night, Late). 

I'm hoping to use these vocabularies/fields for a type of opening hours style tagging, e.g. X venue is open Monday: Morning, Midday, and Evening, Saturday: Evening, Night, Late, etc. 

I'm imagining a situation when I check the box next to 'Monday' the terms in the Time of Day field will become visible and I'll be able to check the 'Morning', 'Midday', and 'Afternoon' boxes. Likewise for when I check any other box next to another Day term.

Can you guys think of a way I could set this up with my field structures?

Thanks in advance!

EDIT: Hey guys, new aspect of this question now. So I'd like to attach tags to different day and opening hour combinations, e.g. Monday Morning X Venue is good for coffee, breakfast, Saturday Night at X Venue is good for cocktails, dancing.

I've currently got a vocabulary of tags. How can I go about linking the tags and the opening hours/days? A heirachy would be an option, but that would make for a hell of a lot of repeated clicking for the user. Any thoughts?
To do a hierarchical taxonomy,  Use Taxonomy Manager and all you need to do is include the hyphen before the child terms, as shown in the answer above when you bulk add terms

You can also use the standard taxonomy manager, and use drag handles to inset children, like I have done below.