Typically referring to a measurement on an imaging study (xray, CT scan, MRI, ultrasound), "sub-centimeter" refers to a measurement less than 1 centimeter.
For instance, a phrase such as "several sub-centimeter perihilar nodes are noted," means there are lymph nodes which are enlarged in the peri-hilar region of the lungs, but these are less than 1 centimeter in greatest diameter.
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Sub-centimeter refers to a measurement that is less than one centimeter in size. It is often used to describe small objects or distances that are smaller than a centimeter unit of measurement.