Can I use computed property in another computed property?

Yes, you can access it directly as you would data props.

For example, the comboTwo computed property uses comboOne computed property as below,

data() {
return {
propOne: 'prop1',
propTwo: 'prop2'
}
},

computed: {
comboOne() {
return this.propOne + ',' + this.propTwo;
},

comboTwo() {
return this.comboOne.split(',').join('-');
}
}