Those string pairs in rusle. Txt are used to display choices for the soil *texture* -- they are only coincidentally related to the user-selectable name of a *complete* soil (which includes texture, OM, hydrology, description, etc.). Only a few sample soils are currently included with the program, so you didn't find the ones you needed.
To create a sandy clay or sandy clay loam soil, open any of the other soils, such as default or silt. Find the texture parameter and change it to the desired texture, or, for more precision, enter the actual sand/silt/clay fractions. Override the values of any other parameters for which you have better data.
Use File/Save as... to save it with a descriptive name. The soil should then be available for reuse elsewhere. More.
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