Please help, I bet it is easy for you

[Jurinho0]

I dont know how to create a sketch in way that will allow to change dimentions without destroying whole sketch. For example we want to change dimention R15 to R150 and the back to R15 and the main goal is not to destroy sketch, It has to look like before changes. Maybe I should use some block options, I dont know, Please help me because Im just starting my work with this software.
Great thanks for all answers

 

[KENAT]

Sounds like you need to find out how to fully constrain your sketch with relationships not just a few linear dimensions.

There are tools in SE to help you see when sketch is fully constrained.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​