Once completing a PCA on a dataset how do I go about adding the PCA scores to data?

I am only new to STATA and was wondering once I have completed a PCA on my dataset, how do I see the scores on the dataset? (The data tab at the top beside the graphics tab)
Also while I am here, after completing a cluster analysis and dendrogram how do I reduce it down to 6 groups (6 groups is enough for the project I am doing), it has given me around 600 groups as there it 760 variables.
Many thanks for any information provided!!