budget - issue adding "Investment" Category and SubCategories

Using Quicken Deluxe 2019 Version 5.9.2 on Mac OS High Sierra Version 10.13.6
When trying to set up a budget, the system won't let me add the category "Investment" or its related subcategories.  This category and its subcategories just don't show up on the list when I edit the budget and click on "select categories".  The category is there when I go to Window > Categories, and the category and related subcategories get used all the time in my transactions.


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