Make the attribute you won't want edited as Read Only. I do this all the time when integrating staking data into existing distribution lines.
In the December 2020 ArcGIS Online update, you can now configure which fields editors can/cannot edit in an editable hosted feature layer. This capability is planned for hosted feature layers in ArcGIS Enterprise at the next release. Thanks for the idea, and please let us know any feedback.
cc @Anonymous User
Thank you for sharing your ideas.
As mentioned by the previous poster, this functionality does exist in ArcGIS Online. For mor information, please refer to the documentation linked below for configuring fields editability.
Control Edits on a Per-Field Basis
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