Extend Part

Hello I am working on a simple part. I use BRICSCAD pretty much the same thing as AUTOCAD. How can I extend a part without affecting certain areas. On the sample picture below I want to maintain the properties in red but what to extend whats in blue and not affect whats in red. How can I accomplish that? When I push pull it just makes the end bigger and changes the properties at the end.

Thanks

Humberto

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