Let's start!
Really, it's very simple. It's a registry of your parts (or at least the parts you want to be allowed to save). This is the file content:
<?xml version="1.0" encoding="utf-8"?>
<properties>
<key name="parent" groupid="#406B0100" instanceid="#7B5E1224" typeid="prop" />
<keys name="validEditorKeys">
<key groupid="YourPartsFolder" instanceid="Part1" />
<key groupid="YourPartsFolder" instanceid="Part2" />
</keys>
</properties>
Add more keys to add more parts. Easy, right?
So for example:
<?xml version="1.0" encoding="utf-8"?>
<properties>
<key name="parent" groupid="#406B0100" instanceid="#7B5E1224" typeid="prop" />
<keys name="validEditorKeys">
<key groupid="creature_parts~" instanceid="ce_cell_mouth_jaw_04" />
<key groupid="creature_parts~" instanceid="ce_cell_mouth_filter_01" />
</keys>
</properties>
And what name do I give to this file? It doesn't matter. Use a name that you know no other mod would use, so it's compatible.
And for the folder, there are too many registry folders, so let's rename them:
1. Go to your SporeMaster folder and open the reg_file.txt file.
2. Add this to the end:
Spoiler
ca_EditorKeys~ 0x406B7BC9
sa_EditorKeys~ 0x406B7BC8
ta_EditorKeys~ 0x406B7BCA
be_EditorKeys_entertainment~ 0x406B7B8F
be_EditorKeys_factory~ 0x406B7B8E
be_EditorKeys_house~ 0x406B7B8D
be_EditorKeys_cityHall~ 0x406B7B8C
ve_EditorKeys_colony-air~ 0x406B7B82
ve_EditorKeys_colony-water~ 0x406B7B81
ve_EditorKeys_colony-land~ 0x406B7B80
ufo_paints_EditorKeys~ 0x406B7B47
ve_paints_EditorKeys~ 0x406B7B3C
be_paints_EditorKeys~ 0x406B7B29
fe_paints_EditorKeys~ 0x406B7B15
fe_EditorKeys~ 0x406B7B14
c2c_EditorKeys~ 0x406B7B0E
skinpaints_EditorKeys~ 0x406B7B0D
ce_EditorKeys~ 0x406B7B0C
c2c_paints_EditorKeys~ 0x406B7B07
cl_paints_EditorKeys~ 0x406B7B06
cl_EditorKeys~ 0x406B7B02
lvl0cl_EditorKeys~ 0x406B7B01
ve_EditorKeys_harvester~ 0x406B7B3D
ve_EditorKeys_military-water~ 0x406B7B3A
ve_EditorKeys_military-land~ 0x406B7B39
ve_EditorKeys_military-air~ 0x406B7B38
ve_EditorKeys_economic-water~ 0x406B7B37
ve_EditorKeys_economic-land~ 0x406B7B36
ve_EditorKeys_economic-air~ 0x406B7B35
ve_EditorKeys_cultural-water~ 0x406B7B34
ve_EditorKeys_cultural-land~ 0x406B7B33
ve_EditorKeys_cultural-air~ 0x406B7B32
sa_EditorKeys~ 0x406B7BC8
ta_EditorKeys~ 0x406B7BCA
be_EditorKeys_entertainment~ 0x406B7B8F
be_EditorKeys_factory~ 0x406B7B8E
be_EditorKeys_house~ 0x406B7B8D
be_EditorKeys_cityHall~ 0x406B7B8C
ve_EditorKeys_colony-air~ 0x406B7B82
ve_EditorKeys_colony-water~ 0x406B7B81
ve_EditorKeys_colony-land~ 0x406B7B80
ufo_paints_EditorKeys~ 0x406B7B47
ve_paints_EditorKeys~ 0x406B7B3C
be_paints_EditorKeys~ 0x406B7B29
fe_paints_EditorKeys~ 0x406B7B15
fe_EditorKeys~ 0x406B7B14
c2c_EditorKeys~ 0x406B7B0E
skinpaints_EditorKeys~ 0x406B7B0D
ce_EditorKeys~ 0x406B7B0C
c2c_paints_EditorKeys~ 0x406B7B07
cl_paints_EditorKeys~ 0x406B7B06
cl_EditorKeys~ 0x406B7B02
lvl0cl_EditorKeys~ 0x406B7B01
ve_EditorKeys_harvester~ 0x406B7B3D
ve_EditorKeys_military-water~ 0x406B7B3A
ve_EditorKeys_military-land~ 0x406B7B39
ve_EditorKeys_military-air~ 0x406B7B38
ve_EditorKeys_economic-water~ 0x406B7B37
ve_EditorKeys_economic-land~ 0x406B7B36
ve_EditorKeys_economic-air~ 0x406B7B35
ve_EditorKeys_cultural-water~ 0x406B7B34
ve_EditorKeys_cultural-land~ 0x406B7B33
ve_EditorKeys_cultural-air~ 0x406B7B32
(lvl0vl is the starting cell editor)
(cl is the advanced cell editor, the one with more parts)
(sa --> Space Accessories, ta --> Tribal Accessories, etc)
Choose the folder you need. This will also rename these folders when you unpack a file.
And that's all. Add your parts to that registry and no ForceSave needed!