Hi, you can add extra sockets either by spuring direct from an existing socket, or by using a 30A JB to 'tee' off a cable run , or put them in the main ring by cutting it , using 2 JB's and inserting a length of cable from one JB through all extra sockets & back to second JB.
What is Not allowed is to 'tee' off the ring to skts & back to a second 'teed' JB forming a double loop or figure 8 shape, this is an absolute No-No.
I'm sure there is a drawing in 'projects' section also,
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