Wich of these entries from a clothing item .cr2 can be deleted without interferring with the well being of the clothing item?
Thank you in advance!

Best regards!

You can remove child body parts that don't exist in the clothing item - best to retain the first children after a necessary body part for conforming deformations though.  If the morphs don't exist in the clothing item, fling 'em away.  Same with material zones.

'Black Star' after YJM? :)

How about baseProp and magnetDeformerProp?Can be deleted?And what are those?I have deleted them and nothing bad seems to happen...Maybe it's hidden.
About the morphs, I want to delete those and make my own morphs.For example, if I will make a pregnant morph, can I still delete the pregnant morph from the .cr2 and later include my own pregnant morph through Poser?
What are CTRL and SCL?They can be deleted?
InkyChain can be deleted if the item is a glove?
addChild can be deleted?
I am trying to make a smaller as possbile file here because with my morphs will become pretty big.Another reason is that I edit it manually.The editors I have used make too many errors.For example, the CR2editor makes the clothing item "No actor present" when in Poser.But if I edit the file manually that doesn't happen...

PS : and no, Black Star is from HMS Black Star, an english frigate...:)

Inkychain is not really useful for conforming figures.

addChild - NO.  These are absolutely necessary to build the figure (they establishes the joint hierarchy).  Only remove addChild sections if one of the two body part actors referenced is no longer included. The complete section is:

addChild actorA
                actorB

baseProp and magnetDeformProp are what they say they are - Poser magnets.  V4 and other figures use them as pseudo-morphs (via ERC master-slave connections).  They may be useful if you want to have the same pseudo-morph deformations as the figure - but probably with some tweaking required.

SCL and CTRL are probably FBM, PBM, or ERC for the magnets.  No idea how necessary they will be.  This is why there is a figure "BLANK" for developers of items for many of these figures - it is a stripped down version without all of these fiddly bits.