# Questions / Help

**URL:** https://forum.sensmetry.com/c/sysml/help/35.md?page=1

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## [Traceability and Cross-Layer Linking in SysML v2 Modeling (ESA Methodology)](https://forum.sensmetry.com/t/traceability-and-cross-layer-linking-in-sysml-v2-modeling-esa-methodology/248)

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**Author:** [@Susmitha\_Suresh](https://forum.sensmetry.com/u/Susmitha_Suresh)\
**Replies:** 1\
**Last updated:** [October 10, 2025, 8:30am UTC](https://forum.sensmetry.com/t/traceability-and-cross-layer-linking-in-sysml-v2-modeling-esa-methodology/248 "2025-10-10T08:30:27Z")

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Hello, I’m working on a project, that involves SysML v2 modeling of a spacecraft subsystem, and I’m following the ESA SysML Solution Methodology where the model is structured into distinct layers (Mission, System of Int…

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## [How to refer to external libraries?](https://forum.sensmetry.com/t/how-to-refer-to-external-libraries/92)

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**Author:** [@Hormo](https://forum.sensmetry.com/u/Hormo)\
**Replies:** 3\
**Last updated:** [June 4, 2025, 2:41pm UTC](https://forum.sensmetry.com/t/how-to-refer-to-external-libraries/92 "2025-06-04T14:41:15Z")

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I’d like to refer to libraries. I used to create references in EclipseIDE and i am unsure how to do this in SysIDE.

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