Problems with If logic for months. If this month, then.

Good Day.

I've been running in circles with this one.

What I wish to accomplish is simple, yet it's leaving me perplexed.

If January, then the number I have in another cell, and Feb through December should be 0. Then as the months tick off, Jan through the month chosen will be assigned a cell, and any months forward would be 0. For instance, if July is chosen as the current month, then c13=y4 and so on up till July, Aug through December would be 0 or "".

If you need a further explanation, I can try to explain further. I don't have any hair left on this simple problem!