Sum and Having select statement question

I have a table, similar to below, needing the LocName values, having the same date, added together.

I will then delete the Null rows and rename the resulting LocName with the summed value.

StoretCode     LocName        ParName        DateTime           Value

95010-A-9        AB 901_4        On Line         201305160000       1
NULL                AB 905_8        On Line         201305160000       4
95010-A-9        AB 901_4        On Line        201305170000        1
NULL                AB 905_8        On Line        201305170000        4
95010-A-9       AB 901_4        On Line         201305180000        1
NULL                AB 905_8        On Line        201305180000        4