Spezification to alternatives

Hi,

we have the following problem. To build a Bar, we need one piece of 160cm, but it is possible to substitute by two 80cm pieces. We do not want to make Sets espacially for Alternatives.

Any Ideas?

We would also like to choose from different alternatives, eg. four 40cm pieces instead of 2x80...

does anyone of you have similar problems? How do you face them?

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