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I am trying to use conditional statements to update a model and bring data forward if the data is delayed.

For example, sometimes taxable sales lag behind other variables. If this is the case I want to bring it forward one month before I do the actual forecast of other variable. However, if the data is up to date, I do not want the actual data to be overwritten by a forecast. Any tips on how to do this?

Thanks for your help.

I'm not entirely sure I follow what you're saying, but I think, perhaps, you're after the: option.

From the manual:

actexist = arg
arg may be “t” (true) or “f” (false). When true, EViews will
exclude periods for all endogenous variables where values
of the actuals exist.