Mark Ganzer from Toro in his presentation talks about editing existing pattern tables. See the picture below
Pattern tables allow you to create complicated or irregular patterns of features or groups by letting you specify unique dimensions for each instance in the pattern through an editable table. Multiple tables can be established for a pattern, so you can change the pattern by switching the table that drives it.
You can modify a pattern table at any time after you create the pattern. Suppressing or deleting a table-driven pattern suppresses or deletes the pattern leader as well. You can use pattern tables in Assembly mode to pattern assembly features and components.
Pattern tables are not family tables. Pattern tables can only drive pattern dimensions, and unless they are unpatterned, pattern instances cannot be made independent.
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Mark Ganzer’s presentation: https://portal.ptcuser.org/p/do/sd/sid=3062
Credits: Mark Ganzer@Toro