Can anyone help, I have a column with project codes in the following format

123
146/5
1246
1344
102/3


Is there any way to sort the column by the numeric values to the left of the
character symbol only, so that it reads:

102/3 and not 123 result with normal sort
123 102/3
146/5 1246
1246 1344
1344 146/5

Is there any way round this other than separating the code into separate
columns ??