How to import the project into Eclipse

[aosenkidu]

Hello Everyone,
I have trouble to grasp how to import the project into Eclipse.
I first imported the parent project alone, but it does not lead to an automatic import of the modules.
If I import the modules (selecting all folders during import) I get many many pom errors. Most of them are "bundle can not be resolved" errors like this one:
"Description Resource Path Location Type
Bundle 'org.eclipse.gef' cannot be resolved MANIFEST.MF /org.modelio.app.api.impl/META-INF line 26 Plug-in Problem
"

Is there an how-to or README how to set up the project(s) in an Eclipse workspace?

Thanx
Angelo