The desktop menu is a two level thing:

1) Desktop Categories (see each .desktop file).

2) Menu definition (see /etc/xdg/menus/applications.menu).

In our case, the current XDG menu-spec has the nearest match
Categories=Office;Finance;, which covers all finance applications.

There is the only thing that could be done immediately: Create separate drawer
for Office;Finance;. It will still mix financial software and crypto currencies
software.

Introduction of more categories is possible, but it needs a wider discussion.

However SUSE specific change is technically possible (use of
Categories=Office;Finance;X-SUSE-Cryptocurrencies;), it is not a good approach.

This change needs a coordinated effort of all distributions and software
authors. So it is not as straightforward as it sounds.

1) Join XDG mailing list and start discussion.
https://lists.freedesktop.org/mailman/listinfo/xdg

2) Create bug in the Freedesktop Bugzilla
https://bugs.freedesktop.org/enter_bug.cgi?product=Specifications
(product desktop-entry)

3) When consensus is reached, prepare specs patch
git://anongit.freedesktop.org/xdg/xdg-specs

4) Wait for approval and release
https://specifications.freedesktop.org/menu-spec/latest/

5) Incorporate specification changes into openSUSE specific stuff:
- build checks
- menu definition
- update_desktop_files

6) Prepare upstream patches for each particular project.