Sub-sections for Theme Builder

My theme builder starts looking pretty cluttered, I'd like to organise the sub-sections into sub-folders I can easily manage.

e.g;

Theme Builder -> Products Archive ->
2021
• Template 1
• Template 2
• Template 3
2022
• Template 1
• Template 2
• Template 3
Project 1
• Template 1
• Template 2
• Template 3
Project 2
• Template 1
• Template 2
• Template 3

Theme Builder -> Single Product ->
Brand 1
• Template 1
• Template 2
• Template 3
Brand 2
• Template 1
• Template 2
• Template 3
Brand 3
• Template 1
• Template 2
• Template 3
Brand 4
• Template 1
• Template 2
• Template 3

etc..