When I use SHIFT+LeftClick on a group of rebars, I want to select only the same type of rebars. However objects sometimes get the same Group numbering (hungarian version calls them "szegmensszám/segment number"), and shift+Lclick will highlight everything with the same Group number.

This makes it impossible to change the placement of a line of rebars of a single position.

Is there a way to dissemble / disband these groups? I could only find possibilities on merging objects, not exploding them.