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Are you using COSMOSXpress or COSMOSWorks? If CX, scan thru the postings on this forum and you should find tips on adding/editing materials in that database. If you are using CW & it is already a custom material, simply type in the Yield Strength in the Apply/Edit Material form. If it is a library material without a YS, with the material data showing in the Apply/Edit Material form, change the source to "Custom" and then you can add or change any of the properties.
Either way, you should be able to complete your analysis just fine without the YS. The solver only needs the Young's Mod and Poisson's Ratio to complete. The only limitation to not having a YS in the database is that a Design Check FOS plot won't be automatic and you'll have to type in an allowable stress in the DesignCheck Wizard.