Partial submission of github and pull request

suppose I fork an open source project, and then I modify some files during the development process, but when I mention pull request later, I don"t want to submit some of them. Excuse me, is there any way?
for example, I will change the ignore file during the development process, and then I do not want to overwrite the ignore file of the original project when I submit the pull request.
at present, we can use the method of not add the modified ignore files, but my project may also be developed by multiple people, which requires the sharing of ignore files between projects, and the add method is no longer available.

Apr.24,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3b1e9-2c277.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b1e9-2c277.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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