There are only two colleges that require you to provide all subject test scores, Georgetown and Cornell (and for Cornell there is some uncertainty on the issue). Thus, if applying anywhere else, you can withhold some subject tests and send others and College Board will never provide anything to the college to even indicate you took the withheld test.
However, there could still be an issue. Many high schools put all your test scores on the official transcript provided to colleges when you apply for admission. Thus, you need to determine what your high school does and, if it is one that puts your scores on the transcript, you also need to determine whether your high school will agree to remove a score from the transcript before providing it to colleges.
Cornell claims it uses your best scores if you submit more tests than required. Its statements on requiring all subject test scores are also somewhat ambiguous and thus one could argue it does not require all subject test scores. If it is of any help, be aware that to date, there has never been a reported case of anyone being rejected for admission because of the failure to provide all test scores from any college that has an all scores rule, despite that such rules have been around since 2009.