Maintain Useful commented codes in separate class in C#

Question

I have a useful commented codes in every classes as below which are used for future references .Is there is any alternative way to effectively maintain commented codes in difference class and can be used only for reference purpose .

//3986 TEST 1199 PROD
//3986 TEST 1199 PROD
//2179 TEST 118 PROD
//3986 TEST 1199 PROD
//3986 TEST 11199 PROD