I'm not certain how ProConnect works, but generally if the 1095-A show zero for all three column, you leave that month BLANK (not zeros).

If there is a number in one of the columns, you can fill out the columns.

If there is something in column A or column C, you can't leave column B (the SLCSP) blank or zero.  You need to look up the proper amount.  If the circumstances are that it really should be zero (such as they were eligible for employer insurance), then you would enter 0.01.