Unless they changed something you will be awarded points for up to 6 years of work experience that happened within last 10 years (backward from the date of EAPR). And you do not need to have them in the same NOC, just all your claimed NOC will have to be 0, A or B. Also you cannot claim time for 2 NOC if work experience was overlapping and in total they made more that 1 full time job (for example you had 8 hours shift with NOC X and then part time with NOC Y, you can only claim for NOC X).
From my last 10 years of work exp. 6 years in NOC 2171 (Skill level A) and 4 years in NOC 2181 (Skill level B which is my primary occupation), so what are the points to be awarded here?