# Is updating custom field data with +/- similar to tags possible? **URL:** \ **Category:** Product Support\ **Created:** [April 5, 2024, 5:41am UTC](https://forum.mautic.org/t/is-updating-custom-field-data-with-similar-to-tags-possible/31565 "2024-04-05T05:41:56Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![litheumsocial](https://avatars.discourse-cdn.com/v4/letter/l/3bc359/32.png) [@litheumsocial](https://forum.mautic.org/u/litheumsocial)\ **Post date:** [April 5, 2024, 5:41am UTC](https://forum.mautic.org/t/is-updating-custom-field-data-with-similar-to-tags-possible/31565/1 "2024-04-05T05:41:56Z")
Hi all, I’d like to be able to track some fine-grained info about a user as custom fields. I’ve tried multiple ways of getting something acceptable but can’t seem to find a good solution. Firstly, I’d like to be able to have a Number custom fields and update it with “+6” and “-10” values, but instead it only can be updated and not added/subtracted from the existing value. Similarly with a multiselect, I’d like to able to add items to the set like in a field like PagesViewed {page1: true, page2: true, page3: false} by sending mt(…, {pagesviewed: {page3: true}} and have this update page3 to true without setting page1 and page2 to false… I know that I can sorta use tags to get something close to this, but I’d really like to be able to be able update custom fields on the contact so i don’t have a giant collection of 100 tags that really should be broken up into categories… I also don’t want to have a separate custom field for each of these. Are there any other options? If I could read a contacts data via their mtc\_id that would also be very helpful… ---
**Author:** ![joeyk](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/joeyk/32/11164_2.png) [@joeyk](https://forum.mautic.org/u/joeyk)\ **Post date:** [April 5, 2024, 5:42am UTC](https://forum.mautic.org/t/is-updating-custom-field-data-with-similar-to-tags-possible/31565/2 "2024-04-05T05:42:22Z")
Not possible right now.