Multiple Businesses Under 1 LLC

[Scott Stevenson]

Hello! I have a quick question about an idea for an LLC and I am not sure if this is possible, how it would work, or if it would be the most effective way to go about it.

I currently have 3 different professions, you could say. 

I own an online personal training company. 
I am a real estate sales agent. 
I am a real estate investor. 

My idea is this: 
I want to have 1 LLC in which these three businesses would operate under it. 
For example.. it might be called "The Stevenson Company, LLC" 
I read that you can then have 3 different DBA's under that, each for the professions that I am in.

My goal with structuring this LLC would be to potentially use the income generated from one area (personal training company) and use it to grow another area (investing) under the same tax filing. (not sure if there is a benefit to doing this)

I am just trying to consider ways to use income in one profession and reinvest in the other businesses so that it can be used as expenses and deductions when it comes to tax filing. 

Also, I figured that having all income and expenses in one place would make things a little easier when it comes time to file. 

I probably made this a lot more complicated that I needed to. 

Thanks for your help.