Allocating Regular Items from Bin Locations in Pick and Pack 
SAP Business One lets you allocate items from bin locations throughout the entire pick and pack process.
To allocate items that are not managed by serials or batches from bin locations in pick and pack, proceed as follows:
Prerequisites
You have enabled bin locations for at least one warehouse in your company.
For more information, see Enabling Bin Locations.
The items you commit in the sales order and A/R reserve invoice document rows are stored in warehouses with bin locations.
The items you commit in the sales order and A/R reserve invoice document rows are not managed by serials or batches.
Procedure
From the SAP Business One Main Menu, choose
Inventory 
Pick and Pack Pick and Pack Manager 
.In the Pick and Pack Manager - Selection Criteria window, specify the selection criteria and choose OK.
In the Pick and Pack Manager - Open Drawer, select the sales order and A/R reserve invoice rows for which you want to create pick lists, enter the quantity you want to release to the pick lists, and choose the Release to Pick List pushbutton.
The Pick List Generation Wizard opens.
In step 1 of the wizard, select a range of bin locations from which you want to allocate the items by specifying the warehouse sublevels and bin location attributes.
In step 2 of the wizard, select the method by which the items in the pick lists are automatically allocated from bin locations.
In step 3 of the wizard, specify the general information about the pick lists and choose the Generate pushbutton.
The pick lists are generated with the items allocated from bin locations according to the range and method you specified in step 4 and 5, respectively.
To manually change the bin location allocation, open the Bin Location Allocation - Issue window by doing either of the following in the Pick and Pack Manager - Released Drawer:
Click
(Link Arrow) to the left of the quantity in the Bin Location Allocation field.Right-click in the pick list row and choose Bin Location Allocation.
Place your cursor in the pick list row and press Ctrl + Shift + A.
Place your cursor in the row and from the Goto menu, choose Bin Location Allocation.
To manually change the bin location allocation again while picking the items for delivery, open the Bin Location Allocation - Issue window by doing either of the following in the Pick List window:
Right-click in the pick list row and choose Bin Location Allocation.
Place your cursor in the pick list row and press Ctrl + Shift + A.
Place your cursor in the row and from the Goto menu, choose Bin Location Allocation.