Here's a small starter kit. Drag and drop into your (saved and backed-up) 
TW file.

Each item where you want to have a list appear needs to be tagged 
"categorylist". Then a list appears where you can click and tag from the 
categories available as tags in the "Categories" tiddler.

So, tomatoes are "umami" ?

Thanks!
Mark

On Thursday, September 5, 2019 at 8:46:42 AM UTC-7, Aidan Grey wrote:
>
> Hey all,
>
> Don't know if this is possible - can anyone educate me? Is there a better 
> way for me to to do this?
>
> ---
>
> User case: I am sorting a huge list of items into 50+ categories, where 
> each item in the list can belong to multiple categories. I will need to add 
> additional categories as I go. In the end, I want to be able to pick a 
> category tiddler, and list all the items that are tagged with it.
>
> What I want to do is *transclude *a tiddler with the checkboxes, so I can 
> update the category checkboxes in one place. The checkboxes in the 
> transclusion should toggle only the tags on the tiddler that is 
> transcluding. So, for example:
>
> Tiddler: Categories - has checkboxes tied to tags, with values like fruit, 
> vegetable, meat, dairy, etc.
> - if I add another checkbox/category, that new category will show up on 
> all item tiddlers
> - it will not be checked on any item unless I go back through the items 
> again and check it myself
>
> Tiddler: Apple 
> - transcludes Categories
> - when I click on fruit category / checkbox, tags Apple with fruit
>
> Tiddler: Tomato
> - transcludes Categories
> - when I click on fruit category / checkbox, tags Tomato with fruit
> - when I click on vegetable category / checkbox, also tags Tomato with 
> vegetable
>
> Tiddler: Mushroom
> - transcludes Categories
> - when I click on vegetable category / checkbox, tags Mushroom with 
> vegetable
> - I decide I want another category, so I go to Categories tiddler, and add 
> a new checkbox for "umami"
> -- come back to this tiddler, umami is now a visible item in my checkbox 
> list, and I check it to tag this tiddler with "umami"
>
> Tiddler Tomato
> - go back here, and click umami checkbox
>
> Tiddler: Fruit
> - lists all the tiddlers tagged fruit (Apple, Tomato)
>
> Tiddler: Vegetable
> - lists all the tiddlers tagged vegetable (Tomato)
>
> Tiddler: Umami
> - lists all the tiddlers tagged umami (Mushroom, Tomato)
>

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Attachment: categories-by-checkbox.json
Description: application/json

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