# Dynamic Sublist mapping

**URL:** <https://forum.dynamobim.com/t/dynamic-sublist-mapping/9611>\
**Category:** Lists-Logic\
**Created:** [February 14, 2017, 4:12pm UTC](https://forum.dynamobim.com/t/dynamic-sublist-mapping/9611 "2017-02-14T16:12:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Kenyon\_Graham](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/kenyon_graham/32/8837_2.png) [@Kenyon\_Graham](https://forum.dynamobim.com/u/Kenyon_Graham)\
**Post date:** [February 14, 2017, 4:12pm UTC](https://forum.dynamobim.com/t/dynamic-sublist-mapping/9611/1 "2017-02-14T16:12:42Z")

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Hi,

I have generated a series of points that are ordered in a dynamic data tree.

Longitudinals:  
{0;0}, {0;1}…  
{1;0}, {1;1}…  
{2;0}, {2;1}…

I would like to get at the point data within the nested list to draw individual longituninal lines between the points.

After the longitudinal points, transverse lines will then follow.

I can do the exercise in Grasshopper but I am floundering in Dynamo.

To add the dynamic aspect I would like to change the number of points and the lists and lines updating accordingly as I change the number of divisions.

 ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/d/3/d3fac5326c6da3f2152900a49b595e8e29bfc479.png)

All help appreciated[Data\_tree-grillage members\_Rev\_A.dyn](https://forum.dynamobim.com/uploads/short-url/8K1Bodos2Lw03kRAduXZJVcssJW.dyn) (109.4 KB)

rgds

Kenyon