Most remote controls are designed to be programmed for only one TV at a time - unless the TVs you want to control remotely are all made by the same manufacturer and operate using the same Infrared (IR) frequency.
If you have TVs from different manufacturers or ones that use different IR frequencies, it is recommended you use a universal remote control that has one or more additional function buttons. Universal remote controls may have a function button labeled as AUX, OPTION, or something similar.
Using a learning remote control is another option if you still have the original remote controls for your TVs. Learning remote controls can be programmed to learn the IR frequencies from your original TV remote controls.