Using comma separated values in a single cell

Wasn't exactly sure how to post a table, but here is an attempt at a table:

B	C	D	E	F	G	H	I	J
Date	Trans Type	Symbol	Shares	Price	Total	TransID	Blocks Sold	Profit & Loss
1/5/15	buy	goog	100	500	50000	3
1/6/15	buy	goog	100	500	50000	4
1/10/15	dividend	goog	5	505	2525	5
1/14/15	sell	goog	205	520	106600	6	3,4,5

Basically, I need to know how to read in the values of 3,4,5 in I6 to calculate my P&L. This is similar to for loops (for iin $variable, do) Bash Scripting (not sure if there are any Linux user on this forum).