copies

Set the number of copies.
[read/write property] copies([out, retval] int *n) copies([in] int n)
This property sets the number of copies to be printed.

This feature is not supported by all printer drivers.

resetParams resets this to its default value, which is to use the driver's default number of copies.

VB6:
pdf.copies = 10
resetParams
emulatedMultiCopy