creo4 config.pro option documentation for: AUTO_CONSTR_ALWAYS_USE_OFFSET 
auto_constr_always_use_offset
Category: Assembly
Description: Control whether auto constraint should create offsets. Yes - Auto constraint alw ays creates offsets. No - Auto constraint snaps align or mate if surfaces are wi thin tolerance. Never - Auto constraint never create offsets.
Values: yes, no, never
Default Values: no
d data, such as Inheritance, External Copy Geometry, External Shrinkwrap, and External Merge.
no
- Ignores referenced parts in the retrieval.
yes
- Prompts the user to accept each referenced part during the retrieval.
ignore_missing
- Skips any missing referenced part, sends a message to that effect, and continues the retrieval process.