Yes, I can give you an idea about how to handle this expense/asset. It's difficult for me to determine in your screen image exactly how you listed the asset, however you would add the plumbing as a nonresidential asset like the home office if you are using that deduction. You can use the same square feet percentage used for your 'storage areas used exclusively for the business' ingredients and sales'. As far as the kitchen where the baking is done, because it's a personal use space as well, it does not meet the exclusive use test. So total home office square feet divided by the total home square feet provides the business use percentage.
The plumbing is considered the same as the office being depreciated over 39 years for nonresidential property. It can be confusing but the office portion of your home is a business and not used for residential purposes. So the rules are quite clear, that it must be part of your home office that can be listed as a new asset in 2023 as a capital improvement using the same percentage you used originally for a home office expense.
You do have an option to determine the home office percentage of the cost, then enter it as an asset at that cost without adding it to your home office expense if you haven't used that before.
Please update here if you have more questions.
@JohnJacob
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