As my “business” is rather small (W23), I’m inclined to incorporate it into my existing system (T85). I will be squeezing sbs into 30-39 as the picture shows. This will break the “standard” numbers, but again, in my world it will make sense, at least for now. I will let you know how it goes, when I’ve been running it for a while. I’m making folder notes for all ids, as they will contain the links to the website. Any thoughts on this in either direction is appreciated 
Interesting. As always, experiments are welcome as long as you report back!
This seems like something I would do too. I’m also mapping the SBS numbers to a different location so I can incorporate them in my system but still be able to link to the website and the forum.
Clarification question: you say ‘squeezing sbs into 30-39 as the picture shows’ but I read the picture as W23 being a full system with the SBS layout intact?
Yes, it almost mapped perfectly into the 30-39 section
Ah. So T85 is 00-29? And the first number is the SBS number and the second one is yours? I was reading it the other way round … 
T85 is my whole system, with life admin in the 10-19, and SBS in 30-39
I’m in a similar boat in terms of having a small business. Mine is incorporated, but it’s just me running it and I have added it as an area within my existing system instead of a system on its own.
My thought would be you have a mix of numbering simultaneously using numbering as if it is its own system but also utilizing numbers in brackets where it would be within the 30-39. I would find that confusing but our minds just may work differently! It feels like you could commit to one or the other and not have the hybrid numbering, perhaps?
My system looks like this, for example:
00's System
10's JMK (me)
20's KCI (my corp)
30's PL (a relative I'm whose affairs I manage)
40's MVP (a program that has NDA content I want separated from JMK notes)
My 20’s section - my SBS - is not yet complete, but this is what I have so far as categories. It mimics my company’s SharePoint library, which was an easy place to start, but I do not want to limit myself to my previous structure. For example, my Administration folder contained things like marketing, website, branding, and general “library of knowledge” things that I will be pulling out into their own categories as I review the files and move things into IDs.
20 Business overview
21 Administration
22 Financial
23 Clients & projects
(future categories still TBD)
29 Archives
My 20’s section is stored physically separate from my personal because they are corporate files, not personal. In my personal file system, where the other areas are stored, I have a folder labeled “20’s KCI (placeholder)” in case I forget it is reserved. At some point, when the corporation winds down those files would likely get moved into my personal storage, and it can fit right in as needed at that time.
Jen