Is it possible to write _CDelay() in C only once?

In a script, can _CDelay ((1000) be written only once in the main (()) main function or only once in each call to _C)))?

The same can be said for exchange.SetMarginLevel ((1), exchange.SetMaxBarLen ((150), exchange.SetContractType ((quarterbar))

Is it possible to write all functions in main only once?