As a paying user here's my two cents. I believe the lack of this feature is not an oversight, but is a design decision. In theory, cloning is considered bad in software design, and should not be convenient. However, “Cloning considered harmful” considered harmful: patterns of cloning in software (Kasper & Godfrey, 2008) argues that this is not always the case. There is a workaround mentioned in the comments I have not tried. I would prefer that there was a clone option, but then I use StarUML only for diagramming rather than as a full featured modelling tool.
As a paying user here's my two cents. I believe the lack of this feature is not an oversight, but is a design decision. In theory, cloning is considered bad in software design, and should not be convenient. However, “Cloning considered harmful” considered harmful: patterns of cloning in software (Kasper & Godfrey, 2008) argues that this is not always the case. There is a workaround mentioned in the comments I have not tried. I would prefer that there was a clone option, but then I use StarUML only for diagramming rather than as a full featured modelling tool.