Whenever there are repetitions of circuits in the project, it is preferable to encapsulate them in a block, repeating it as many times as necessary, prefer automation of the component designator assignment process. This feature is available at least in the CAD tool I use (you did not mention yours). In the case of Altium Designer, using the REPEAT feature, a suffix would automatically be added to all repeated devices, not just the capacitors; for example, all other capacitors on the board would be named as C1, C2, Cn, ... while the capacitors on the channels would be something like C4_1, C4_2, C4_n, ... (perhaps there is the alphanumeric entry option, I guess).