changing values within a indicator

Is it possible to change a value within an indicator on my chart

In the indicator is a variable lnvalue what i would like to do is change this value if a specific condition is met within my ea


ie if V>V1 Invalue = "";

the principle is that a trade is triggered if price crosses a line drawn by the indicator- the trigger i use is the description within the object string value lnvalue ie lets say the object description is short but i do not wish this to be recognised if the volume is increasing then by changing this value to "" the trade will not be triggered if V<V1 ie volume decreasing as price approches line then Invalue = short and a short trade triggered if price crosses line - logiv being that if volume is decreasing then line will more likley work as resistance

hope someone can help

Most object properties including the description can be changed easily. There may be an exception that I can't think of at the moment. Lots of examples and explanation in the online help.