try a boolean subtract
what I can see in Your picture is, that You have a part copy and due to there are 2 bodies involved it could be a part copy from an assembly.
The question now is, how have You got this assembly?
Normally from within the assembly there should be those separated part files accessable as single parts, are they?
Maybe You can provide Your original input file for testing.
I tried to rebuild it by saving an assembly as step and parasolid followed by an import into a part.
But in my case I always get multible bodies but multiple features too.
So then I create a part copy from an assembly, and now I can see the same situation as on Your image.
But there already is an assembly to use if wanted so.
Maybe YOu can also explain what Your goals are so we get a hint what the direction might be.
I think that this will not be possible since it only is one single feature.
Tried it here but You can not substract one feature from itself, even it is possible to select one of those bodies.
Next assumption was to use the split command, but again doing so needs a split object which You don't have at all.
I think the most successfull way might be to ask where those data cames from and what it should become
Maybe a save as and an import into ASM will help
I need to have a multy body linked to an assembly file because I want to do some feature on the multy body file so I will not use assemly feature however I have to delete a body in multy body file but not in its father assembly.
it appears that currently these are construction bodies. convert to design bodies and then you should be good... RMB opn the design body to convert
I have tried but it does not work. It seems that isn't possible to delete a body. The only way seems to be to delete the relative feature. I am using Solid Edge ST8...
I also think that a body delete will not work due to it is a single feature.
You can see the assembly parts as bodies but You cann't do anything.
If You - as @MattJohnson_PG suggested - import the assembly as "Design Body" rather than a "Construction Body", You will be able to create features to it.
Depending on what Your intends are, You can consider to start with a part - multibody part - and send this to an assembly, also associative.
Or You use assembly features instead.
can you share the file...