TSL % works as follows:
Say your entry price is Rs 100 and you have a SL of 20% with a TSL of 10% - 5%.
Entry Price = Rs 100
SL Price = Rs 120
TSL: 10% - 5%
For every 10% x Rs 100 = Rs 10 movement in your favour the SL will move 5% x Rs 100 = Rs 5. So if Entry was at Rs 100 and SL at Rs 120, the new SL when price goes to Rs 90 will be Rs 115.