Copying 12 Months Data Across The Page To Down The Page

I have a dataset that is as follows:

Col1 2 3 4 ...... 45

123 456 xxx xxx xxx
100 234 xxx xxx xxx
221 543 xxx xxx xxx
112 234
112 689
122 956
122 234

This goes on from left to right for 45 odd columns.

I need to copy each set i.e set 1 is 123 down to 122 to say cell a25 and then copy the next set i.e. 456 to 234 below the first set.

I need to somehow write a loop code that knows where to get the 2nd, then 3rd set, etc and copy it to the bottom of the preceeding set