I want to Send two IR Codes with 1 button

Working on a TV remote with a 10 button only. If I program one button to channel 8, it works. The next button I want to program to channel 45, I can’t get it to work. The question is can you program a single button to sent two IR codes?
BUTTON 4 : 170F443E1B000400170F443E13800400170F443E13800400170F443E13800400 : 256
BUTTON 5 : 170F443E1A000500170F443E12800500170F443E12800500170F443E12800500 : 256

Are we expected to guess everything about your project?
Hardware, software, etc.

Yes.

Show us what you have done.

Yes

The question is can you program a single button to sent two IR codes?

Just make sure to leave at least 20ms between each signal - so you don't confuse the receiver. 100ms would be better.