Translated by moderator. See below the line for original post.
Do not create group curve in Archi-Lab. Hope everyone help
Original post below.
Không tạo được Group Curve trong Archi-lab. Mong mọi người giúp đỡ
Welcome to the forum @danhvuxd7. The official language here is English, which is a requirement for search to work. Please translate future posts using the online service of your choice. Your original/native language can be kept as well (it may help if we ever get multiple language support) if you put it after the translation as I did in the edit of your post above.
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Hi @danhvuxd7 and welcome 
can i ask what do you mean by Do not create group curve in Archi-Lab
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Try the node Polycurve.ByGroupedCurves which is included out of the box now.
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The lines cannot be connected together according to the list in the group curve.
Yes. Bro
I want to join Curves in a list. Please show me how to do it.
You will need to provide your script and related model that is failing for assistance as we will be unable to reproduce your error most likely without it.
If the model is confidential, copy the problem elements to a model so we can reproduce and observe your error.
We cannot help unless we see where and how it is not working for you.
Use the node I mentioned before followed by the PolyCurve.Curves node.
try the one as mention, Polycurve.ByGroupedCurves, I guess the reason archilab doesnt work is that one is in python and need the right dynamoironpython package installed as well
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