You can merge and bundle ideas:
How to Merge and Bundle in 5 min
What is Merge?
With Merge you merge multiple ideas into 1 idea. The other ideas will be connected as child ideas to that selected idea.
What is Bundle?
With Bundle you create a new idea and the other teams will be connected as child ideas to these new created ideas.
How do I see if an idea idea is connected to another idea?
Open an idea and then on the right sidebar you see "Related objects".
Here you can find connected child ideas, parent idea, selection missions, projects, etc.