If I have well understood your problem, you must redefine the symbol following the image below. You redefine the symbol then click attributs then you choose the option in the red rectangle. When finished don't forget to save.
I have found something in the help center about this, but I have the french version. Here's a snapshot helping to find the location of this help in your language version.
i fined it in English and Russian but it doesn't help me where are no data about proportional (i want to change height and length)
It's in the last paragraph, it says if you place an annotation not based on the text dimension. Once it's placed and defined you can modify the proportion.
A symbol can only be uniformly scaled. There is no option to scale it separately in only one direction.
Symbol geometry cannot be driven by relations. Text substitutions can be made from relation driven parameters or dimensions.
It's possible that a Toolkit application could be created to do this, but I think it would have to create a separate symbol for each location to have independent aspect ratios from the prototype. So far I haven't heard of any third party offering dynamic symbols for Creo.
Symbol geometry is embedded in the drawing it's used in. Saving to disk has no effect unless a user specifically forces the internalized symbol definition to be replaced with an external (disk) version.
attached there is an "ellipse" symbol, which allows you to change its proportions.
Just copy the file in the Creo symbol folder - typically its C:\PTC\creo_standards\symbols\ and add via the "custom symbol" function to your drawing.
Use offset as the attachment method if you want to link it to a view or a dimension.
I used Raphaels method to create the symbol and I can change the proportions just fine.
I think the OP wants a parametric value in both X and Y for the symbol.
The symbol may need to be driven by relations if that is even possible.
I am no expert on symbols but thought I'd point this out.