Code Shopify Quantity to allow selling in 0.5m units and enter on admin page for 1m

We have a website selling fabric. Our inventory system enter the price for 1m. Shopify admin has to match this so price is set for 1m. We need to sell in minimum quantities of 0.5m as per the product page. Specifics: we sell fabrics and want to sell them in 0.5m increments so 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 e,t,c up to the total available in stock The problem is that we need to enter the price for 1m i.e. 10.99 in the PRODUCT>PRICE in admin as this links to VEND our POS system However we do not want to add 200 variants so it goes up to 100 as this is too much Can you think of a solution and the prices need to be off numbers. i.e 10.99, 9.95 e.t.c as well as 11.00 We have two different products, FABRICS & TABLE PVC FABRIC - smallest 0.5m TABLE PVC- 0.1m smallest going up 0.1, 0.2, 0.3m e.t.c 1m Price is 1x10.99 0.5m = 0.5 x 10.99 1.5m = 1.5 x 10.99 2m = 2 x 10.99