In our case, we have cut to length items such as fuel hoses, plastic tubing, foam strips, edge guards, etc that are bought in bulk, then they are cut to length on the assembly line.
Today we create manual WTpart BOM's because we have not associated our CAD models to the WTparts yet, but getting ready to 
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I am trying to figure on how to handle the cut to length components. Our WTpart default unit is in inches per below which is carried over into our ERP (Oracle).
So I associate the CAD model to the WTpart, I am thinking it will be "image" association because the CAD model will be configured at a different routing each time. The BOM quantity will show up as 1 instead of the required quantity (such as 30, for 30 inches of tubing). How do I get it to show up as 30 ?
Any suggestions would be great
We haven't found an elegant way to do this, as you cannot drive a quantity other than "each" from a Build Rule. So your WTPart with the Default UOM "inch" cannot currently be driven from CAD. Avoiding the obvious idiot 
idea of just sticking a BOM table on the drawing and hoping it gets handled correctly in Manufacturing, there are two approaches we have used.
One approach is to just associate the many different length CAD files as "content" (passive, no build), then manually manage the quantity of the WTPart in the structure. This at least lets the collector etc work and doesn't require any additional WTParts, but does requires human involvement to avoid missing the "inch" part from the WTPart BOM entirely.
Another method is to create a WTPart with default UOM "each" for every different length from CAD, then manually add the required quantity of the "inch" part as a component to the structure of the "each" WTPart (so your each component has a BOM showing a quantity of X inches of the inch part). Then you let CAD Drive the "each" into your WTPart structure via the Build rule, which drags in the required length of the "inch".
This second approach gets you a part number for each fixed length, which may actually be handy in ERP if you need to hold inventory or transact on the individual cut lengths. If not then in the ERP system you set the "each" to be a phantom and you get direct demand for the required quantity of the "inch" automatically. There is also probably an option to do something in Windchill using a gathering/phantom part, similar to the above approach. Still involves a somewhat unnecessary WTPart though.
