SBA loan for "part" of a business

Does anyone have any experience with purchasing a portion of a company and how to get SBA financing for it? The deal I am looking at is 2M purchase price for the "maintenance" portion of a landscaping company (mowing and cleanups). There is also a "hardscape and excavation" portion of the business that is not being sold, and is actually bringing the numbers down significantly. I am worried that the underwriter will see that the tax returns do not align with the P&L and get scared off. My thoughts were to "adjust" the tax returns to account for only the maintenance portion, but what does this look like in practice?