Hi:
If you are working in the SAS Academy for Data Science in the Virtual Lab, we need to know the module you are working on (Predictive Modeling, Advanced Predictive Modeling, or Text Analytics, Time Series and Experimentation). Within the module, we need to know the class you're working on; and for the class, what exercise or demo are you doing that has you adding observations??
Once you provide this information, we'll be able to provide more relevant help.
If you are NOT in the SAS Academy for Data Science, but are using SAS Enterprise Miner for a class or for a work project, there is a separate Data Mining forum, here:
https://communities.sas.com/t5/SAS-Data-Mining-and-Machine/bd-p/data_mining that is for Enterprise Miner users who are NOT in the SAS Academy for Data Science.
Cynthia