The best way to manage negative keyword is to start from your Google Ads shared library.
Please log in to your Google Ads account, click to the “Tools and Settings” / then “Negative Keywords” under shared library.
There you’ll find the option to create your own negative keyword list.
I recommend organizing your negative keywords into small individual lists and apply the lists to your campaign from here.
While adding or removing negative keywords, I recommend updating it from the list here and it will automatically apply to the campaign who are using the particular lists.
Or add your negative keyword to a negative keyword list!
This way, you will always find your negative keywords organized.