Genespring already provides some normalization methods (percentile, quantile...) when you import the raw-data. I guess you are going to apply a normalization method which is not provided by your version of Genespring.
In my case, I performed the normalization with R (Python or other software), then imported the normalized data into Genespring.
Can you please send a example data sheet for manually calculate normalization factor/ intraarray 90th percentile shift normalization value without using the gene spring software?