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I have 2 filters that work well :
1. Matches to the phrase "NA"

 "query": 
 "match": 
 "region.keyword": 
 "query": "NA",
 "type": "phrase"
 
 
 

2.Uses a scripted field that pulls filters to show all hours not between 0-7:

 "script": 
 "script": 
 "inline": "boolean gte(Supplier s, def v) return s.get() >= v boolean lt(Supplier s, def v) return s.get() < vgte(() -> doc['@timestamp'].date.hourOfDay , params.gte) && lt(() -> doc['@timestamp'].date.hourOfDay , params.lt)",
 "params": 
 "gte": 0,
 "lt": 7,
 "value": ">=0 <7"
 ,
 "lang": "painless"
 
 

I would like to group this into one filter so its "NA hours not between 0-7" this way I can change the region and the times and still apply additional filters.

Also not sure how to add this kinda custom filter as adding a filter only allows me to put in 1 field

Before you make use of visualizers and discover, make sure that you create index pattern under Management -> Index Pattern -> Create index pattern` and add the name of the index on which you'll be applying filters.

Now, combining the queries you've added in the question, the combined query would be something like below:

 "query": 
 "bool": 
 "must": [
 
 "region.keyword": 
 "query": "NA",
 "type": "phrase"
 
 ,
 
 "script": 
 "script": 
 "inline": "boolean gte(Supplier s, def v) return s.get() >= v boolean lt(Supplier s, def v) return s.get() < vgte(() -> doc['@timestamp'].date.hourOfDay , params.gte) && lt(() -> doc['@timestamp'].date.hourOfDay , params.lt)",
 "params": 
 "gte": 0,
 "lt": 7,
 "value": ">=0 <7"
 ,
 "lang": "painless"
 
 
 
 ]
 
 

Discover Section

In Discover section of Kibana, select the index name in index pattern section(refer to the link for the image) and then click on Add a filter, there in the right side you would see an option Edit Query DSL.

Copy and paste the above query. You should be able to see the results in Document Table i.e. the document details under the graph.

Visualizer

Well you have not mentioned in the question if this is related to a particular visualizer(or discover tab), however just like the way we've added filter in discover section, you can do so in the visualizers as well (say for e.g. in Metric Visualizer where you'll see Edit Query DSL section under Add a filter)

Let me know if this helps!