The day’s opening number is 48786.

To reduce this to a single digit, add all the digits together:
4 + 8 + 7 + 8 + 6 = 33
3 + 3 = 6

So, I want to mark the 6th candle in intraday 5 min time frame. This can be labeled on top of the candle, or the high and low of the 6th candle can be marked with a horizonal ray – line.

logic is if high is broken of 6th number candle i will go long and low broken i will go short

I have tried doing convert number till single digit, but unable to plot lable and horizontal ray

// Function to round off a number
round_off(num) =>
    math.round(num)

// Function to sum the digits of a number
sum_digits(num) =>
    sum = 0
    temp_num = num
    while temp_num > 0
        sum := sum + (temp_num % 10)
        temp_num := math.floor(temp_num / 10)
    sum

// Function to reduce to a single digit
reduce_to_single_digit(num) =>
    temp = num
    while temp >= 10
        temp := sum_digits(temp)
    temp

// Get the opening price of the day
day_open = request.security(syminfo.tickerid, "D", open)

// Round off the opening price
rounded_open = math.floor(day_open)

// Reduce the rounded opening price to a single digit
single_digit_sum = reduce_to_single_digit(rounded_open)

// Plot the result as a label on the chart
onedigit= label.new(    x =start915,    y = Upper_ProfitBooking_Level,    text = str.tostring(rounded_open)+"=" + str.tostring(single_digit_sum)+"",    style = label.style_label_down,    color = color.blue,    textcolor = color.white,xloc=xloc.bar_time)
label.delete(onedigit[1])