Hi,

Yes, orientation explain in few words

Conventional

The Height of part are along Y of CN (DXF)

The Width of part are along X of CN (DXF)

Top of left side to the top
Top of right side to the top

Part rotation

The Height of part are along X of CN (DXF)

The Width of part are along Y of CN (DXF)

Top of left side to the left
Top of right side to the right

Grain direction horizontal

Similaire orientation than Part rotation with conventional grain direction

Most of time select this option if your in Nesting CNC and greatest axis is X 

Grain direction vertical

Similaire orientation than conventional with conventional grain direction

Top of left side to the Top

Top of right side to the Bottom

*Most of time select this option if your in Nesting CNC and greatest axis is Y

Horizontal max dimension

Highest dimension Height/width on X (usually for CN with suction cup)

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Last option “Invert part” rotates the parts by 180°.

For example, with “Part rotation”, the front edge of the part would be towards the front of the machine but with this option the edges will be opposite

Please find basic test cabinets for understand export more easily

First for part rotation with arrow

Second with edges (with specifique edges)

Hope that’s helpful, Alex