# "Add list" to a list field only those values ADDED by user on a multidropdown

**URL:** <https://forum.bubble.io/t/add-list-to-a-list-field-only-those-values-added-by-user-on-a-multidropdown/20806>\
**Category:** Need help\
**Created:** [November 22, 2017, 8:00pm UTC](https://forum.bubble.io/t/add-list-to-a-list-field-only-those-values-added-by-user-on-a-multidropdown/20806 "2017-11-22T20:00:28Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![cheskiefisch](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@cheskiefisch](https://forum.bubble.io/u/cheskiefisch)\
**Post date:** [November 22, 2017, 8:00pm UTC](https://forum.bubble.io/t/add-list-to-a-list-field-only-those-values-added-by-user-on-a-multidropdown/20806/1 "2017-11-22T20:00:29Z")

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I have a multidropdown with its default value reflecting a list field called “A” in the database, when a user selects additional items to the dropdown in addition to what was there before, i want to save those additional selected items to a separate list field called “B”.

So i have a “modify a thing” action with the field “B”, what do i write?

add list multidropdowns value and?..

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**Author:** ![romanmg](https://sea1.discourse-cdn.com/bubble/user_avatar/forum.bubble.io/romanmg/32/237672_2.png) [@romanmg](https://forum.bubble.io/u/romanmg)\
**Post date:** [November 23, 2017, 5:35am UTC](https://forum.bubble.io/t/add-list-to-a-list-field-only-those-values-added-by-user-on-a-multidropdown/20806/2 "2017-11-23T05:35:57Z")

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B add list (or set list) multidropdown’s value :filtered, where the filter is unique ID isn’t in list A’s unique ID.

You take the multidropdown list and filter out list A’s items.

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**Author:** ![cheskiefisch](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@cheskiefisch](https://forum.bubble.io/u/cheskiefisch)\
**Post date:** [November 23, 2017, 3:28pm UTC](https://forum.bubble.io/t/add-list-to-a-list-field-only-those-values-added-by-user-on-a-multidropdown/20806/3 "2017-11-23T15:28:04Z")

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@romanmg

> [@romanmg](#):
>
> where the filter is unique ID isn’t in list A’s unique ID.

Thanks roman

How would you express that in bubble language? (After :filtered)

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**Author:** ![romanmg](https://sea1.discourse-cdn.com/bubble/user_avatar/forum.bubble.io/romanmg/32/237672_2.png) [@romanmg](https://forum.bubble.io/u/romanmg)\
**Post date:** [December 1, 2017, 12:03pm UTC](https://forum.bubble.io/t/add-list-to-a-list-field-only-those-values-added-by-user-on-a-multidropdown/20806/4 "2017-12-01T12:03:47Z")

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See screenshot for the same type of filter on a repeating group source. Instead of search for users :filtered, yours would be “multi-dropdown’s value :filtered”

 ![is-2017-12-01-09-02-45-738](https://us1.discourse-cdn.com/bubble/original/3X/2/3/235d33642558573538fd91fe8d5a0fab1e67ab4d.png)

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**Author:** ![system](https://us1.discourse-cdn.com/bubble/original/3X/2/8/2847faa74692c2ffa5d939d3dc3724cdd060d247.png) [@system](https://forum.bubble.io/u/system)\
**Post date:** [January 31, 2018, 8:00pm UTC](https://forum.bubble.io/t/add-list-to-a-list-field-only-those-values-added-by-user-on-a-multidropdown/20806/5 "2018-01-31T20:00:40Z")

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Closed on January 31, 2018, 8:00pm UTC

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