How the within day pick list is generated

I would like to know which calculation/priorities/roles the system uses to generate the pick list.

I do not understand how the pick list is generated during the day, i.e. the calculation of the quantity for each item depending on the amount of pick. 

For example:  Whereas that the shop floor cleared for all and there are a group product with items A, B and C and the Items are sequenced with a capacity of 10 each and UOM = unit. The pick list will generate the follow results:

Item SOH   Capacity     End of Day   Amount to Pick  Pick List   Amount to Pick Pick List     Amount to Pick Pick List