Advanced studies in Retali design

hi Friends,

i have done UNdergraduate Diploma in Accessory design. Currently working in Retail design field. Want to know more about where i can do my further studies in retail design or VIsual merchandisng.
M really confused between Commercial INterior design & Retail design programmes.
I have also done search for institutes offering any programmes in Retail design. But couldn’t find any…
What is d best way to develope urself in Retail design field.

If u have any info, kindly help me…

Thank u for ur help