How to hide or make selective fields on requisition preference page, as uneditable

Summary:

We have a requirement where the requesters should be able to edit only the 'Requisitioning BU' field on the requisition preference page and all other fields should be made un-editable.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

24B

Code Snippet (add any code snippets that support your topic, if applicable):