I want to file my passwords in categories: eg Credit Cards, Assurances, Shopping, Knowledge ... ao ...
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Custom categories are not possible. I might suggest using Secure Notes and or Tags in combination to get a sorting option that works for you. Secure Notes also support Markdown formatting which may also be beneficial to you. Due to each category's underlying data structure, it is not possible to change items from one type to another.
Is there a way to put tags in other Tags, not sure how I did this. See pic
You can create nested tags by using a "/" character