Portfolio Composite consitutuients delayed Time Series Data

Hi Amibroker Forums,

Quick question regarding composites. I plan to make a composite that tracks an active portfolio.

I also plan to Add the Portfolio Constituents (E.g Stocks) data only be part of the composite past a certain date (when I enter the stock). Just to further clarify I only want certain symbols to print time series data in the composite past a certain date I manually set. E.g stock X starts printing in the composite past date Z | stock Y starts printing in the composite past date B.

I'm aware on composite construction, but I'm unsure of the way I can implement the date-specific symbol printing, there are no functions that I'm aware of, any help would be greatly appreciated.