Okay, just to be clear (I’ve reviewed documentation, app, app store, etc), there is no way to add expenses in the core Toggl app? Additionally, is there no separate Toggl work app to empower “efficient expense management”?
Hey there 
Please can you confirm which types of expenses you want to add? 
That’s correct, there is no Toggl Work mobile app ( Work is currently in maintenance mode).
I can pass this on as feedback to the team once I hear more about your use case in detail 
Thanks!
For my consulting business, primarily travel-related to trips is nice as it can be aligned by client/project, split by IRS/tax categories for easy EOY processing. This includes mileage and being able to get calculated rates. Meals, hotel, flights, parking - the fundamentals.
For my STR/property management business, which I also track time for, I’d also want tax-oriented categories to start. This includes advertising, maintenance, cleaning, fees, etc.