Manual Idoc Creation

Hi

Someone today pointed to me that its possible to create/trigger a IDoc manually, i mean we have one inbound IDoc in Production server data comes from External vendor creates SO there is some problem in that Idoc.

to replicate the same scenario in Quality first i need to create a Idoc (For which data has to come from Ext vendor but its nor possible) for that some one pointed out that you can copy the same Idoc or create the same idoc in quality.

Can anyone explain me wahts the Tcode and how do we do the same?

Reg

Shankar1242