BLOCKBUSTER ENTERTAINMENT <BBEC> SELLING UNIT Blockbuster Entertainment Corp said it will sell its investment in Amtech Corp to the company chairman, David Cook, and president, Kenneth Anderson. The company said the sale is taking place because Amtech is not compatible with Blockbuster's main line of business, will require substaintial additional funding to develop and market its product, and is expected to sustain operating losses for the forseeable future. The company said Cook and Anderson will form a new company with the sale called Amtech Holdings Inc.