# List subset / Merge entries into one list and giving false for others back

**URL:** <https://forum.dynamobim.com/t/list-subset-merge-entries-into-one-list-and-giving-false-for-others-back/83852>\
**Category:** Lists-Logic\
**Created:** [December 7, 2022, 1:34pm UTC](https://forum.dynamobim.com/t/list-subset-merge-entries-into-one-list-and-giving-false-for-others-back/83852 "2022-12-07T13:34:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KevSch](https://avatars.discourse-cdn.com/v4/letter/k/eada6e/32.png) [@KevSch](https://forum.dynamobim.com/u/KevSch)\
**Post date:** [December 7, 2022, 1:34pm UTC](https://forum.dynamobim.com/t/list-subset-merge-entries-into-one-list-and-giving-false-for-others-back/83852/1 "2022-12-07T13:34:15Z")

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![Pointlist](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/5/1/5140faa5c786599d7f17c6ec3ff299be0081e7cd.jpeg)

Hallo,  
i have two lists where List B (50 points) is a part of List A (150 points). The entries are scatterd and not in the same order. I was trying to get a uniform list of 150 entries where i can see on which position the points from List A are in List B. But somehow i cannot match them by equal node and bool mask…

greetings  
Kev

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**Author:** ![Daan](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/daan/32/82246_2.png) [@Daan](https://forum.dynamobim.com/u/Daan)\
**Post date:** [December 7, 2022, 2:33pm UTC](https://forum.dynamobim.com/t/list-subset-merge-entries-into-one-list-and-giving-false-for-others-back/83852/2 "2022-12-07T14:33:26Z")

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Hi @KevSch ,

Have you tried the node List.IndexOf? This node returns the first index of an item found in the list. List.AllIndicesOf returns all indices if an item occurs multiple times.

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**Author:** ![KevSch](https://avatars.discourse-cdn.com/v4/letter/k/eada6e/32.png) [@KevSch](https://forum.dynamobim.com/u/KevSch)\
**Post date:** [December 15, 2022, 1:19pm UTC](https://forum.dynamobim.com/t/list-subset-merge-entries-into-one-list-and-giving-false-for-others-back/83852/3 "2022-12-15T13:19:08Z")

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I have tried it. But it wasn`t helpful for my problem… so i did a workaround to avoid this by seperating the pointlists from the beginning into sublists,… somehow this works 😃