dynamic columns

Hi SDN's

I have a internal table with the following fields

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BUKRS |ZUONR |WRBTR |SGTXT

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1 -|A1190 -|100 -|310 static

1 -|A1190 -|200 -|310 static

1 -|A1192 -|150 -|311 static

1 -|A2330 -|100 -|310 static

1 -|A2330 -|150 -|310 static

1 -|A2330 -|500 -|321 static

1 -|A3450 -|100 -|310 static

1 -|A3450 -|200 -|311 static

1 -|A3450 -|300 -|321 static

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I need an output like this... considering the first 3 characters of SGTXT i need dynamic columns for each unique SGTXT and sum up all the amounts related to the ZUONR

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BUKRS |ZUONR |310 WRBTR |311 WRBTR |321 WRBTR |so on......

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1 -| A1190 -|300 -|150 -|----

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-|so on .....

1 -| A2330 -|250 -|----

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-|500 -|so on .....

1 -| A3450 -|100 -|200 -|300 -|so on .....

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I am not sure of the number of SGTXT's.. so i need them dynamical columns based on the number SGTXT's in the internal table

Regards

Pratyusha