You should be able to add folders without merging, which is puzzling. But like I said I would not try adding to the !DAZ folder manually. It's not quite as difficult as hacking in ERC manually to a cr2 but you'll need nerves of steel to add all those delta files and such correctly without botching something up. In particular if you're adding a morph package manually on top of an already installed Daz figure morph channel data folder structure.

---

W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

My Freestuff and Gallery at ShareCG