coding data into treatments

[#1]

I have raw data of about 3550 data points and need to code this data into four different treatments. Any help on how to go about this?

[#2]

You need to provide more specifics. 

Is data point 1, treatment 1, data point 2, treatment 2, up to data point 4, and then start with treatment 1 for the 5th data point, etc.?

Or, are the first quarter of the data points, treatment 1, the second quarter, treatment 2........?