rpas rules doubt

Hi All,

I need your help for the below calculation.

	subclass	sku1	sku2
calendar	sales	sales	sales
1/1/2016	12	1	3
2/1/2016	13	2	5
3/1/2016	14	3	6
4/1/2016	15	4	8
5/1/2016	16	4	2
6/1/2016	17	6	1
7/1/2016	18	7	5
8/1/2016	19	4	2
9/1/2016	11	8	9

Now I need to find out calendar position where sales total is >=50 for subclass using tssum

Also then find out the respective tssum value for sku1 and sku2 using that calendar position

I have found below way to do so but not sure if it's correct.

subclass sales measure   subsales -->  (day_scls)

sku         sales measure   skusales --> (day_sku) ,total --> agg, repl --> spread

threashhold value measure threshld --> (day_scls) ,naval-50

date for start the sku         startdate --> (day_sku) type -->date