Shopify mini tasks

Do you know how to hide certain products to only be shown to selected customers that I want to select ?

Also
Need
A sub category’s

cat and sub cat list below

if it says all sub cat then please take sub cat title from www.cakerysuppliers.co.uk

cat = Cake Spoungs
sub cat = Slab Sponges , Round Sponge ,

cat = Confectctionary

cat = Ingredients
sub cat = Creams, Flavours & Fillings , Sugars & Powders

cat = Drum boards & Thin boards
sub cat = all sub cat names

cat = packing & disposables
sub cat = cake boxes , plastic & disposables, Cup Cake Boxes, cupcake-cases

cat = party-accessories
sub cat = sparkling-fountain-candles, Birthday Candles, Heliumn Balloons, Balloon Accessories, Helium Tank

cat = cake-decorations
sub cat= Chocolate & Nut Decorations, Silk Flowers, Sugar Decorations

cat = food-colouring
sub cat =sugarflair-pastel-paste, Sugarflair Spectral Paste, Sugarflair Extra Paste

cat = drinks
sub cat = Hot Drinks, Cold Drinks

cat =edible-printing-supplies


cat = Cake Nozzles


cat = clearance