In PSoC4 the routing is a bit limited. The non-UDB-components have got defaulted pins which you should use. The first build usually assigns them. For the UDB-components you are not limited with routing (except some special ports as P_4) but you are limited in the number of UDBs.
There are UDB Master and Slave and there is an SCB component which can be configured as either master or slave.
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Pin limitations discussed here -
http://www.cypress.com/documentation/application-notes/an86439-psoc-4-using-gpio-pins AN86439 - PSoC® 4 - Using GPIO Pins
Thank you, Bob & Dana.