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= Tools > Update Multipolygon =

This tool quickly updates a [[JOSMImage(data/multipolygon)]] [wikitr:/Help/Concepts/Object#typemultipolygon multipolygon], one of the most common [[JOSMImage(data/relation)]] [wikitr:/Help/Concepts/Object#Relations relations].

The actual outcome of the action relies on the [wikitr:/Help/Dialog/SelectionList selected] [[JOSMImage(data/way)]] [wikitr:/Help/Concepts/Object#Ways ways] and relations:
 * If only ways without [wikitr:/Help/Concepts/Object#Membership membership] of a multipolygon are selected, the action is identical to [[JOSMImage(multipoly_create,24,link=,middle)]] [wikitr:/Help/Action/CreateMultipolygon Create Multipolygon]
 * If one selected way is member of a multipolygon or, additionally to ways, a multipolygon relation is selected, the existing relation is updated by moving most of the tags from the ways to the relation and adding the remaining ways with appropriate [wikitr:/Help/Concepts/Object#Roles roles], `outer` and `inner`.


== Examples ==#Examples
=== Add a new inner ring ===
 1. Select a relation and new members that would form a multipolygon
 1. activate a tool

A multipolygon will be updated with a new inner ring. In example below we reuse [wikitr:/Help/Action/CreateMultipolygon##MultipolySingleOuterAndInner old relation].

[[Image(multipolygon_updated_with_2inner.gif,link=)]]


== Advanced Preferences ==#AdvancedPrefrences
The same preferences as [[JOSMImage(multipoly_create)]] [wikitr:/Help/Action/CreateMultipolygon#AdvancedPreferences Create Multipolygon] influence this action.

== See also
* [[JOSMImage(multipoly_create,24,link=,middle)]] [wikitr:/Help/Action/CreateMultipolygon Create Multipolygon]

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