I have learned a lot about cables under tension from jj77 who is knowledgeable about this, and may have something to add.
A command called INISTATE creates an initial state of stress (or strain) in an element at the beginning of the solution. Look that up in the ANSYS Help system.
Attached is a model of a long cable that has an initial stress applied so you can see how it is done.
Since you want a force, you will have to calculate the stress that force will create in the cable.
For a cable, Stress = Tension Force / Cross-sectional Area.
Pay attention to the units once you start using Command Objects.
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