[GNC] Adding ASSETS & LIABILITIES to sub accounts

[Luis Sini]

TL;DR
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I would like to add "ASSETS" and "LIABILITIES" account types as
sub-accounts but GnuCash only allows it if they are "Top Level Accounts"
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Hello to everyone,
I make money personally, I own a couple of properties, and I also design
and manufacture audio devices. These are basically different entities, and
I know that I can create a separate GnuCash file for each one of those
ventures. But, I wanted to create 1 GnuCash file that will allow me to have
a comprehensive view of all my financial activities while being able to
track each venture separately.

I've gone ahead and created the following structure:

   1. PERSONAL WORK
      1. INCOME
      2. EXPENSES
   2. PROPERTIES
      1. PROPERTY A
         1. INCOME
         2. EXPENSES
      2. PROPERTY B
         1. INCOME
         2. EXPENSES
      3. AUDIO DEVICES
      1. INCOME
      2. EXPENSES

What I would like to do is add "ASSETS" and "LIABILITIES" sub-accounts to
"PERSONAL WORK" and each of the "PROPERTIES". Unfortunately, GnuCash only
allows me to assign sub-accounts types as either "Income" or "Expense"
unless the parent account is not set up as either Assets or Liability? I
can make an account an "Asset" or "Liability" if the account is a "Top
Level Account". Is there any way to get around this limitation?

Thanks in advance.

Luis S.