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Answer:
A detailed discussion on this topic is available in the article posted at the following link
http://communities.bentley.com/products/structural/structural_analysis___design/m/structural_analysis_and_design_gallery/253408.aspx
Question:
What is the difference between choosing a foundation support of the type Y-ONLY instead of Y?
The answer to this can be found at
https://communities.bentley.com/products/structural/structural_analysis___design/w/structural_analysis_and_design__wiki/2066.staad-pro-developing-the-model-faq#FAQ6
The YONLY type of support is useful for modeling a friction-free base. However, stability in lateral directions has to be provided by alternative means like additional restraints along X and Z.