take a look of the "TABLE COATING" under the user manual. There is no single coating can allow total tranmssion as well total reflection at the same time at a "single wavelength" at the same incident angle with respect to the incident surface. If it is something simple like a 50:50 tranmission/relfectio situation, you could simply used "I." type of coating. If the beam no 1 and no 2 are at differernt wavelngths then you could make use of "Table Coating", so you can then define the transmission/refelction at a given wavelength as well as incident angle. There are some examples privided in ZEMAX as well as in the user manual/ B0A y
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Hope this gives you a direction to look into :)
