You see the following fields in the Settings tab of the Item Master Maintenance dialog box:

Resellable: Check this box if this item can be sold to customers. Asset and expense type inventory items are non-resellable by default.
Stock Item: Check this box if you want to track on-hand values and quantities for this item. If this item is purchased or produced as needed, deselect this box. Service items are non-stock by default.
Sales Taxable: Check this box if you charge sales tax when you sell this item to a customer. You can change whether or not you charge sales tax when you create an invoice or a factory order.
Keep History: Check this box to save this item's sales history for each of the preceding 36 periods. You can view this information whenever the inventory record displays.
Purchase: Check this box if you purchase this item from a vendor, rather than manufacture this item in-house. This is for informational purposes only.
Make: Check this box if you manufacture this item in-house. This is for informational purposes only.
Phantom: Check this box if this item is manufactured in-house as a component of a completed item, but is not itself available for resale. This is for informational purposes only.
Class: Enter your own code for grouping items. The field appears on stock labels and all inventory reports. You can limit most inventory-related reports to include one inventory class or a range or classes.
You can set up a list of valid entries for this field using rules you create in System Manager.
Misc Code: Enter your own code for grouping items. You can limit most inventory reports to include items with one miscellaneous code, or with a range of codes.
Qty Decimals: Enter the number of decimal places used to record quantities of this item. The number of decimals will then appear in any quantity fields that reference this item.
ABC Analysis: Choose the ABC analysis code that applies to this item from the drop-down list box. ABC analysis is a method for classifying inventory items according to their values in relation to the overall inventory. If your company has already categorized items, assign the appropriate code for this item.
Cycle Count: (Only available for stock items) Enter a two-character code to group this item for cycle counts. Your entry is checked against the cycle count codes you have defined for your items.
Inspection: Check this box if receiving inspection is required for this item.
Commission: Check this box if you pay commissions to your salespeople for sales of this item. In order for an item to be subject to commission, you must associate it with at least one product line.
Customer #:
Comm Code: Enter a two-character commodity code in this field. Commodity codes are typically used to group items by type. You can group most inventory reports by commodity code.
You can define your own set of commodity codes in either of two ways. The first is to create codes to group items that are controlled in a similar fashion. The second method is to base your commodity codes on an established government sequence that groups items as similar type products. You can use either the U.S. Government Producers Price Index or the U.S. Government Standard Industrial Classifications (SIC) as a model for your commodity codes. The advantage of this second method is the ability to obtain government price trends and other statistics.
Def Supplier: Enter or select the vendor number for the principal supplier of this item. If the code for this supplier doesn't exist, you are prompted to enter a new supplier. See Item Suppliers for more information about adding suppliers for this item.
Drop Ship: Not applicable.
UPC Code: Enter the Universal Product Code number that applies to this item, if any. This information is for reference purposes only.
Bar Code #: If you use company-specific bar codes, enter the applicable bar code number in this field. This information is for reference purposes only.
Unit Weight: Enter the weight per stock unit. This information is for reference purposes only.
Lots: (Only available if the company is set up to track lots.) Indicate whether you track lot numbers for this item, and if so, at what point of the sales order process.
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